Rgp-delivery.net78.net?

A person in another country asked me to deposit an amount to pay a Nikon camera which is to be sent by the company in question

Never use any delivery company except a major company like FedEx, DHL, TNT, UPS, etc and ALWAYS pay by credit card. You are only protected with a credit card
Scammers try to get you to contact fake shipping companies and pay with non- refundable payments that offer zero protection like Western Union, Moneygram, bank transfer, Greendot Moneypak, etc
Tell them you will use escrow.com to handle the payment and will arrange your own shipping as you get discounted corporate rates through UPS, FedEx or whoever and need their address
If they don't agree, it's a scam

EDIT -- the address they list has already been reported as a scam using a different delivery company name http://escrow-fraud.com/index.php?page=fraud_data&id=12883
They list a SCOTTISH phone number, not a Staffordshire number

Here is the REAL shipping company located at that address http://www.wmshipping.co.uk/
I just rang them and the person who answerd confirmed that there's no company named RGB at their address and that they are not associated with that company. And they said to cease contact with that company