I ordered some gutter and fittings from Screwfix a couple of weeks ago - on a Friday. Not especially urgent. 2 boxes of fittimgs arrived Saturday before I got up. Gutter didn't arrive, online tracking said 2 of 3 delivered. Waited over the weekend, called, 'oh dear, despatched same time as the other bits, looks like its gone missing, will send some more'. Arrived next day, no hassle, no 'prove you didn't get it', just plain excellent and trusting customer service. What's not to like?*
* the only not to like for me is the 'highest first' default sort on reviews. I always change it to most recent first. You always get some bad reviews, I look for the 'mix'' - if they are all bad maybe avoid, a few bad ones to be expected. Some are just plain silly: along the lines of "wouldn't fit my 10cm hole, one star...so why did you order a 15cm item I ask myself"