Any of the Wilko lagers will do it for you - Light Golden or Pilsner I've done. Wilko also do the Coopers Original Lager and that is a great bet and my suggestion.
Pick up 500g of Light DME whilst you are in the store and brew the kit with DME and 1 kg table sugar and it will be good to try it out if you leave it 2 weeks in the fermenter and then 2 weeks in the warm to carb up in the bottles (or keg) and then at least 2 weeks in the cool.
This will be good, cheap and reliable. Not brilliant, just at least as good as the mass produced and marketed stuff you get in a supermarket (better if you are are meticulous with cleaning your gear and patient).
Good luck with it, mate :drink: