Ill give you a idea on mine.
Aged 24, 2002 Clio 1.2 16v Expression (Group 3). Standard except for cd player. Passed car test in 2000, bike in 1998 (has no effect in a way). Now have 3 years no-claims bonus, no claims nor convictions. £380 Full Comp with £200 excess. Had car from new, 2nd owner on V5. Added my mum to the policy as she is a careful driver, and added the gf who is older again. Seems that i may not be driving it as much in their eyes.
Now, bear in mind your age, how you will mod the car, etc...
I would think around £1000 if ideal for a young person full comp on a clio at 17. Being 21 with a XR2i was £1400 TPFT. Im now looking into getting a Impreza, so i have to start the process of looking again.
Theirs my input..
Alias