If you get the Halfords voucher, they also cover Tredz. Its always worth looking for what bike you want outside of those two shops, then speaking to the bike shop its in and ask if they will accept the Halfords C2W voucher. Leisure Lakes isn't listed as an approved dealer but they accepted my voucher Just watch though, the bike I was looking at had 16% off but they put back on 10% so that they could "make some monies on the sale". Whatever...