You can buy a DAS6-Pro on Detailing World (Group Buy) for £99. Huge range of polishes including the above mentioned Menzerna range. I would guess the most popular polishes for sale are the Meguiars 105 & 205. These will let you work on almost any paint, two small bottles will cost you about £10 each and would be enough to do more than several cars.
As for pads, Hexlogic are probably the most popular although I would suggest the difference between most pads is not huge. If buying everything in one go I would also buy some spot pads, you will need some small backing plate as well, these are perfect for intricate areas such as door frames. Also get some masking tape and something to clean up after polishing eg IPA or something like CarPro Eraser, Bilt Hamber cleanser polish etc
Bilt Hamber clay is very good and you get a lot for your money, I also really like Sonax clay although this is more expensive.
Vast array of waxes for sale but does it need to be a wax
There are probably a lot of other things you could buy if you wanted, products like Bilt Hamber Korrosol or CarPro IronX are very popular for removing metal from the paint. You have not mentioned anything to do with wheels, again the Bilt Hamber wheel cleaner is very popular. For trim and other rubber products there are products like CarPro Dlux or Gtech C4. Lot of glass sealants such as Gtech G1. Bilt Hamber do a really nice general cleaner called Surfex HD which then leads us on to the products generally called APC's (All Purpose Cleaners), these are great for the interior and exterior