yekke2: this is what I could find:
City: Heathrow
Address: Terminal 3 Departure Room 69 Zone C. Heathrow Airport
Telephone:
Lost & Found: 0044 (208) 759 9484
Cargo Tel: 0044 (208) 759 1311
Fax: Cargo Fax: 0044 (208) 7594509
Opening Hours:
(Monday) 10:00 – 19:00 (Tuesday – Wednesday – Thursday – Saturday – Sunday) 10:00 – 16:30(Friday) 13:00 – 19:00
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City: London
Address: The Kensington Centre 66 Hammersmith Road London W14 8ud
Telephone: Administration: +44(0)2070134955
Fax: +44(0)2076020381
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City: LONDON
Address: The Kensington Centre 66 Hammersmith Road London W14 8ud
Telephone: Reservation and ticketing: 0844 822 1110 (10 lines)
Fax: +44 (0) 207 603 1133
Have fun!