Here are the contact details of VisitBritain and the other national tourist boards:

VisitBritain
9th Floor 
1 Palace Street 
London 
SW1E 5HX
VisitBritain

London & Partners 
6th Floor
2 More London Riverside
London
SE1 2RR
England
Visit London

Northern Ireland Tourist Board
St Anne’s Court
59 North Street
Belfast
BT1 1NB
Northern Ireland
NITB

VisitScotland
Ocean Point One
94 Ocean Drive
Edinburgh
EH6 6JH
Scotland
VisitScotland

Visit Wales
Welsh Assembly Government
Brunel House
2 Fitzalan Road
Cardiff
CF24 0UY
Visit Wales