In my Monoposto days I used to go up to Donington Park after national race meetings and get F Ford tyres and later F3 tyres off the likes of Carlin for £10 each. A bargain, and ideal for club Motorsport.
The answer is no :-)
The F3 tyre is both wider and taller than ours although similar in construction.
Fortunately we have a great deal with Hankook and a bespoke tyre at £499 per set (plus vat) which performs well and has durability and consistency.
As the regs say;
The sole suppliers of Hankook racing tyres to the Championship are:
Hankook Motorsport, Mr Tyre (Motorsport Ltd.), Unit B, 33 Pitsford Street, Hockley,
Birmingham, B18 6LJ
Tel: 0121 551 4589