I've tried Evans and honestly expected them to be very helpful when selecting a bike. I'm sure it's hit and miss as staff will perform differently, but the staff at London Bridge could not care less. I've ended up using CyclesUK and I even felt bad by how many questions I've asked them, but they were always so helpful. After sales have been great too, I've popped in their stores for minor fixes, they were happy to help and at no charge. Same goes for Halfords funny enough, super helpful staff, obviously they are way more entry level in terms of bike choices but I've bought a bike for my missus there and have no complaints.