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I think Awesome (Manchester) can do a cruise control conversion. If you went there it would be worth considering an APR remap because it can be switched by the stalk AFAIK.
Revo is also a very well established and highly rated tuner. Ideally you want a tuner who is very experienced with the 2.0T FSI engines and can look after you longer term.
K03->K04? You're looking at about £3,500 to do it properly with everything thing you need.
It's only advisable to get an aftermarket fuel pump if you have a combination of high flow performance exhaust, high flow tubular intake (such as ITG), and a Stage2 remap rather than a Stage1. The more expensive HPFP (fuel pump) is a new APR but it's considered more durable longer term than the cheaper Autotech/KMD which only upgrades the internals. I don't have direct experience of this but this is what some independent experts say - Others may not agree.
The reason for the HPFP with those mods is that you risk fuel cuts on the stock pump - It's not a guaranteed problem but a definite risk.
But power is useless without traction so there's a whole raft of suspension and handling mods to add to the never ending list - Modding is a very slippery slope!
HTH