As an update to this - RUK guys have said apparently the spec has now changed back to being 195/40 r17 tyres as standard, and will definitely not be changing to 205/40 r17s as default.
I have twingo 133 renault sport with cup chassis and all extras. It came with 195/40/17 which i also could not find anywhere close or for a good price!! I changed to 205/40/17.... now im hqppy... bit better ride tooo... i say!!