I would buy a cheap new set of clubs like the ones you linked to and then purchase a better set of irons in the future once you start to improve and once you know golf is for you. I'm assuming all the grips need to be replaced? If that's the case then you're looking at £80-90 just to replace the grips presuming the set is something like 4-SW, then a bag will set you back at least £30-40 even if you got a mega cheap one from ebay, and a driver will be at least the same amount. You'll be looking at close to £200, if not a bit more.
I started out by playing with a cheap Dunlop set similar to the ones you're looking at, and while they weren't great clubs by any means, they did allow me to work out if golf was going to be the sort of sport I'd stick with long-term.