Until close of play Monday, Superfi are giving away a £20 voucher for every £100 spent - probably instore only, but it might include phone orders too.
Vouchers can be used against any item costing more than £100 instore or via Telesales up to 31 March 2017. As many vouchers as you like can be used, up to the value of the second product purchased.
Some of the brands they sell (Ruark, for example) is never ever discounted and always sells at the same price, so this is a good opportunity to get a discount on these brands.
Links through to the standard £10 off £100 voucher offer, but this has been doubled to £20 off £100 for a couple of days.