Kye left in boot , rac came but no access to boot , back seat fixed , central parcel entry fixed, any idea .....

This is one of those 'Yes - No' answers. Rear seat that drop were an option on the V40 so the answer could be no. Take a look through the left side of the back window at the rear parcel shelf, next to the left head rest. Your looking for a small push button panel, about the size of cigarette box, with two buttons on it. If it's not there the rear seats are fixed into position.

If there is one there you might be able to 'trip' the lock spring from inside the trunk. This method is for a much newer model so it might not work.

Look inside the trunk, high up on the rear seat where the flat of the seat meets the parcel shelf. There should be a metal rail going all the way across the car. I've attached a photo. Looking straight up at it there are holes in it and you should be able to see a spring or a cable through one of them. Using a chunky, flat blade screwdriver you might be able to 'flick' the latch to release one side of the back seat.

The spring is a strong one sort will fight you. To do this you'll be lying with you legs hanging out of the trunk wrestling with it, Probably swearing a lot as well.

If you manage to drop the back seat you probably need a small person to wriggle through the hole as I think the rear seat pad needs to be lifted for it to drop all the way.

I did same thing. I called local sherrif office. Surprisingly, a Deputy came right out.

I don't know if this applies to the Mito but the 159's have a release cable tucked under the rear left seat cushion.

look up your manual normally an entry from rear seat to facilatate a flat battery

It is possible to open from the inside, but causes a little bit of (hidden) cosmetic damage, so only do this if you have to get the boot open because it is completely jammed shut.

Remove the headrest from one of the sides of the back seat. I used the side where the smaller part opens when folding the seats down, but I would suggest you use the other side as once you get the seat down you have a bigger opening to let you get the other side down too.

The parcel shelf is in 3 parts, a wide centre part and 2 small endpieces which carry the slots for the seatbelts. Once the headrest is removed, insert a screwdriver into the join between the end-piece and the center part of the shelf, and lever the end-piece up an inch or so, grasp it and pull it up enough that a couple of clips disengage. Then, you will see that the centre part is now a loose fit. Next, using a sharp knife, a Stanley knife or similar, cut the centre shelf from the outside edge towards the middle, for about 30cm. Make this cut as far down at the back of the seat, and when you put it back and the headrest is reinstalled it will be invisible (well, almost)...the neater the cut, the less likely it will be seen afterwards.
Next, peel the centre shelf towards you, away from the rear window, until you can see a hole in the metal sub-shelf below. Ignore the two round central holes with cloth covering, but go for the elliptical hole near the side of the shelf.
Remember what the seat-back release cables look like in the boot? Held up with clips either side, the cables have a ribbed rubber sheath. Stick your hand in the hole into the boot and locate the cable. It will not be possible to unlock the seat release because the knob is out of reach (unless you have VERY long, bendy arms) but the clips are nt very secure, so just grasp the cable wherevr you can and pull hard to diislodge the clip. The cable will come away from its retaining clip, or actually, the clip will pull out of its housing and then you can simply fish the end out and release the seat-back.

Next, reach in and yank the other cable out too, or, if you can release the other seat-back easily in the normal way that would be better!
Now you can crawl into the boot.
With a screwdriver, remove the plastic cover that covers the boot-lock mechanism. A good torch is handy here! The 2 visible screws come out ok, but you will probably have to yank the cover off since you cant get at the bottom edge to ease it over the lock. Don't worry, it will split open, and can be popped back on later with no difficulty, just a small split in the plastic.
Finally, looking at the exposed lock, you will see a little lever with a hole in it, on the left hand side as you face the back of the car. Simply flick this up with your finger and the boot will open.

OK, it sounds complicated, but actually it took me just 20 minutes, 10 of which were used up trying to decide whether or not to cut the parcel shelf!
My mechanic has now fixed the problem so my boot opens as normal now, but I don't know what he did yet as he has gone on holiday and didn't tell me what had gone wrong, but it was certainly an electrical problem. However, his list of parts used lists only wire and terminals, so I don't think the solenoid was broken, just not getting power.
Anyway, until you get it fixed, just leave one of the rear seats unlocked, and you can crawl in and open the boot anytime.
Hope this helps! Colin

fold down the back seats climb into boot you will find a **** in the upholstery on the boot door , stick in a screwdriver and slide across the manual mechanism

typical of renult that is,,,the french never did like us!
i would take the kyes back to the renult dealer and in no unserten way tell them the goods they sold you "were not fit for the purpose" and you demand your money back or they get you the right kyes that fit your car,, and pronto at that!
"""its all coverd in the sale of goods act""",and it sounds like you got them by the n*ts on this one
if you can try to get the car down to the dealer or call the "AA" or "RAC" out to do this for you,,,or you could get a lock smith to get the kye barrel out that way you will have the kye number on it or the lock smith could reset the lock to take your kye,,,
bit pricy this way,,,best thing is get the right kyes

If car has fitted option of split fold rear seats, open the boot & on underside of parcel shelf near boot hinges there is pull handles

If u pull the rear seat cushion and back rest u should be able to crawl through.