My feet are size 13 and for years couldn’t get any covers in my size, boots off..
Always have the covers in the van now.
Cheap pack from screw fix lasts forever even though they only last once.
Any trip outside requires a new pair when needed.
Carpet protector roll for longer jobs.
Some of the boiler manufacturers employees can be miserable, but generally they’re professional and polite.
I do hate white/light carpets though. Even with covers on its a worry, I’ve had a screwdriver fallout my tool bag and leave a nice mess on her carpet!, scardeypants you can make of that what you will!!