Will the end amount in PayPal be in GBP if set to GBP through payment processing tool?

Also, I want the end amount in my Paypal account to be in GBP as I have not set it up to receive it in any other currency. Would the customers money be changed from non-USD to GBP when he/she has payed?

I am not quite sure what you mean, but I presume that the question is the same as on your other thread.

Basically, when you set your payment processing integration to accept certain amount, that is the amount that you will get.

Your customers can make the payment over any other currency, but they will be charged the conversion rates as well, since you are expecting the specific amount set in GBP - which is what you will get.

Hope that this clears it out, but if you happen to have any further questions in regards to this, or if your question was about something else, do let us know and we would be happy to assist and answer them for you :)