Then you need to send them an invoice for £62.
If this is your first time invoicing you need to follow these rules when you type something up:
1. Type INVOICE big up at the top
2. Write your details (name and address)
3. Write their details (company name and address)
4. Make it clear that they are being invoiced (eg. 'Invoice to:' )
5. Type a description of goods (eg. xxxx.co.uk domain name and transfer fees)
6. Next to the description put the price
7. Usually at the top you would put an invoice number (for your records), a PO number (if they have given you a purchase order number - often not), and the due date (when you want them to pay you by, eg. +7/30 days)
8. Payment method on the bottom (eg. Please pay by cheque to 'Bob Smith' or BACS to sort code 00-00-00 account number: 1234 5678)
Then email it to them. You can put paypal as the payment method or only have BACS - whatever.
Once the payment has cleared then initiate the transfer. I hope I've not missed anything.
Here's a link to one I just found in google so you can see the layout:
http://billingmanager.files.wordpress.com/2007/11/professional_invoice_template_1.png
If I was you I'd edit your posts to delete reference to the domain name just so that they don't see this when they search for their domain.
Good luck.