Screwfix and Toolstations business model is click and collect! infact the founder of SF sold out to B&Q and started Toolstation (cheeky), their stock is always spot on (loads better than Wickes and B&Q) and the prices are competitive because they need less floor space and staff.
Nothing more annoying when you want to pick up a £3 order to get a job finished and someones at the counter asking to "look" at things or trying to take masonry drills back because they wanted straight shank and the girl at the counter sold them SDS and they didnt "look"
I renovated a house in about 3 months using SF and TS for tools and fixings and all materials from a merchant, If I had to mill around B&Q, Wickes It would of took me a year, its about efficiency, for the retailer and customer, my local branches are always full of self employed tradesmen who cant afford to *** about at other suppliers,