I've also received the scam letter, addressed to Misss Tom which is kind of hilarious (my first name is Tom). Other than the name, the letter is very convincing. Do not call the number, as others have noted it's not actually Westcot's number but a pretty sophisticated scam.
This is an absolute scam. We received a very official letter purporting to be from Westcot Debt Collectors saying we owe £55, 15. If you check the official Westcot web site you will see that their number is just a few digits different. So DO NOT CONTACT the number 01482 484620 as IT IS A Scam!!!!
I have just received a letter that had the above number on it saying I owe PayPal 186. 34 checked the number 01482484620 this number is a scam almost gave me a heart attack when I opened it mrs XXXXXXXXXX