If you're still looking for some active DJ Speakers for around the £500 mark you can't go far wrong with a pair DB Technologies Cromo 8+ or 10+. These are Portable active PA speakers. The perfect active speaker for any mobile DJ looking for a set up for parties. And you'll still have some cash left over from your budget.
Cromo 8+ £189.00 inc VAT and Shipping (each)
Cromo 10+ £229.00 inc VAT and Shipping (each)
Alternatively browse the selection of active pa speakers at soundbase meagstore for your self
https://www.soundbasemegastore.com/pa-live-sound/pa-speakers/active-pa-speakers/