Watched all of them, the first series with Jeremy Clarkson and Phillipa Forrester was the best, as he used to subtley rip the pish out of the geekier / more serious contestants.
Roadblock won the first series on a judges decision after a 6-way battle royal, but it had just flipped everyone without a Srimech all the way through. Never acknowledged wedge robots after that.
The second series was boss because of the final, Panic Attack vs Cassius. Cassius was the red hot favourite because it was contolled by Rex Garrad, a highly experienced roboteer who had made the first series final with Recyclops. Plus he was the guy who actually came up with the Srimech idea.
Panic Attack were a lot less experienced and they'd not particularly set the world alight before then. On the night of the final though, they beat Cassius hands down to claim the title against all odds.
The king geek was deffo George Francis from Ipswich, a genius who got to the final in series 1, and won back to back titles (series 3 and 4) with Chaos 2 (another wedge). You probably remember him as the ginger bloke with a funny voice - I bet he had a great time at school!