As for the cars looks to me like:
F1600 - Formula Ford, Kent (slicks, tubular chassis)
F1800 - Formula Ford, Zetec (slicks, tubular chassis)
F2000 - Formula Renault (carbon tub?)
Formula Target - Italian F3 (carbon tub)
Anyone got any other thoughts, intresting they bothered with the 1600, would of thought open diffs and push rod engines would take some time to fettle just for a few potential cars (assuming they stick with current cars).