Correct, yours would be due at some point next year. Mine's an '07 on 39,000M, registered May '07.
The 288/280 set look quite similar to the spec' of the CatCams 401 (287/282) but offer a bit more lift. K-Tec do them for £780, we may get more of a discount from them? They say the 402s give around 19BHP peak and they're a fair bit milder than the 401, so I'd say that it'd be a pretty much nailed on 20BHP increase...