Right this is what I did and in this order.
I speak NO French
Control Technique, Approx E70 Take your UK Logbook V5. and your driving licence proof of FRENCH address and of course Euro's
I went into book and ended up with a Control Technique carried out, seems there is no booking just turn up.
Immatriculation. Approx E130 varies with Manufacturer
No not the immaculate conception, its a piece of paper required by the Sur Prefecture from Peugeot to prove the Peugeot is in fact a Peugeot.

Proof of No TVA or import duty, This ones Free Local Tax Office or Customs
Insurance, Now we used Generali (they will insure on a monthly basis a car on UK plates)
Now you need at least four copies of every document before you attempt to go to the Sur Prefecture's office for the Certificate Provisoire d'Immatriculation ( a temporary Carte Grise) this paper will allow you to purchase your number plates, in Grasse they also fit them as they have to be pop riveted on by law. you don't have this paper until you pay what is deemed the registration fee which is worked out on the C/O part of your logbook (cars over 10 yrs don't have this so you have to ask for it when applying for the Immatriculation, don't ask don't get) and if you don't ask you have to pay again!!!!!!!!!
The Carte grise (UK equivalent to a Log Book is sent to you in the post)
A few words of advise, take plenty of copies of everything and staple the relevant ones together, keep them SEPARATE from the original forms.
If doing the running around for some one else have a letter from them in FRENCH that says it is ok for you to work on their behalf. ALWAYS have your Passport and driving licence.
The final bill has to be paid in Cash or FRENCH cheque.
It took me three attempts at the Sur Prefecture mainly as I didn't have the correct paperwork, and the Sur Prefecture employees where i went are sticklers for the letter of the rule. Each time I went it was a wait in excess of two hours.
I suppose you could call it a dry run for the Range Rover which also has the added problem of being fitted to run on GPL Liquid Propain Gas, don't ask the problems that has thrown into the pot!!
Good Luck