Be really careful with this guys. GSF have put their prices up on a lot of items to offset the good value ones.
Take leisure batteries, for instance. Purely because I'm in the market for one.
The cheapest online is £61, delivered. Boggo shitty make. 110Ah.
Go outdoors charge £80 for one, plus £5 for their discount card- or £120 without the card. Again 110AH, again boggo shitty make.
GSF charge £150.53, also 110Ah, also boggo shitty make. MILES more expensive. Even with your 40% discount, it's the most expensive option, at £90! Plus you get the absolute joy of dealing with GSF staff and products, who and which, by experience, am bellends (as they say in the Black Country).
Even Halfords- who usually supply pretty decent stuff (I genuinely do despise Halfords, but credit where it's due) come in at £89 at the moment- but that's for a 115Ah, so despite being better value than the GSF offering is not comperable- plus it's on offer ATM.
In summation, Your Honour- GSF am bellends.