It finally stopped raining so here's what you should have.
1. A top carpet which is fairly rigid and hinged about halfway so you can fold it back.

2. A second carpet which is moulded to the shape of the spare wheel and provides a bit of storage and some support for the top carpet.

3. The spare wheel itself which is secured to the floor by a large plastic threaded nut type thing.

4. A moulded grey polystyrene tool holder for your jack and wheel brace which fits in the wheel well just under the off side light cluster. I've photographed it in position and removed.


5. If you have alloys as standard (a Dynamique should) you should also have the locking wheel nuts in a small plastic case and a set of four steel wheel bolts for use with the steel spare wheel (these are originally supplied in a small bubble wrap envelope).
I think that's it. Hope it's been some help.
You can usually find what you need on ebay if you're patient. There's a tool kit and holder on at the moment and a boot carpet.
http://www.ebay.co.uk/itm/RENAULT-MEGANE-dynamique-2006-TOOL-KIT-/170738440563?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item27c0cdd973http://www.ebay.co.uk/itm/boot-spare-wheel-cover-carpet-storage-megane-1-9-dci-3dr-03-08-/250920095570?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3a6c00cf52 
Clio 1.5 dCi 88 Dynamique Tom Tom in Oyster Grey + Twingo GT in Pearl Black on a '58'.