Mr biased speaking here.
North West FF1600 is the one. Just read the positive comments on TT and you'll see why.
I suppose Combe FF1600 comes a close second, followed by any other FF1600. Next up any single seater race car series.
As to things with doors, I ask what is that all about? You can get the same entertainment at the fun fair for a couple of quid in those things with big stalky things sticking up out of the back [and sparks if you are lucky] "Only toilets have doors"
