Hi @shazb70 thanks for your reply.
Okay I'm really sorry, but if anything credit-wise on the phone hasn't been used for 180 days or more then the credit amount is lost - this is consistent to all PAYG phone users with Virgin Mobile.
All mobile phone companies have this policy in place, but some companies vary with their timescales.
Please accept my apologies once again for any inconvenience caused.
Many thanks
Tom_W