I think they have cheaper electricity as well and shut down for a few hours lunchtime. Also, their windows open inwards and they have shutters outside for shade.
Pay someone else to do it, sit in the garden and drink tea with buttered toasted teacakes using clean hands and no blood. As for the wheel arch liner - if it ain't broke don't fix it. Your car is only three years old.
2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.