Scottish Mountain Gear did a fantastic job repairing my Mavic HC H20.
I managed to mangle the underarm catching it on something sharp and it wasn’t an easy self-repair as there was some material missing. They cut out the damaged area and have sewn in new material in a way that you’d never notice any of the original damage. Very impressed and happy.
£20-30 would be a lot to repair a £50 jacket but I could justify the much better job done by the professionals on a ~£200 jacket and feel it is a reasonable expense given the quality of the repair and mess the material was in after damaging it.