well i was going to buy 3 sets of 5 wheels from them and they did a deal and knocked about 60 quid per wheel off iirc.. not a drastic amount on a set of 4 but when you got 15 then it adds up.. no harm in trying mate

and if your ony buying 4 i doubt they will take anywhere near 60quid of overall.. but as i said mate no harm in trying