Hi. I don't know whether you fly back and forth t UK but if you drive then check out bimble solar on internet or eBay.co.uk. They have great offers on solar panels, full systems too, possibly the best prices. Batteries can also be bought on eBay if you want to bring them over. Another alternative is technosun.com (or .es) Based in Valencia i think, they do complete systems, individual items, roof mounting kits etc, etc. Finally, supermercadosolar, based in Girona have good deals too.
Good luck.
PS. Buy a small electric/battery engraving tool and mark your panels, inverter with your parcela & poligon number + your phone number. Engraving the aluminium structure with this info means thieves have to grind away at the thin frames. A pain if you're a robber!!   ;)