Some GP's will charge to provide you with a letter/confirm that you need to have a home assessment for your PIP claim - but this depends on your GP surgery. Have you asked your GP surgery already?
Hello again @charmed,
To be honest it really varies from GP surgery to the next as to how much they charge; my personal GP surgery charges £25 as standard for anything but I know in some cases it can be much higher.
Depending on whether your GP surgery does charge you, the other way you could go about it if the charge is expensive is to request all of your medical records under the freedom of information act (FOI) which I think is a maximum of a £10 charge - however there is no guarantee that the DWP will accept your medical records as evidence that you need a home visit without a supporting letter. Just an idea any how.