I have some old contact numbers for Flight Briefing units, worth checking them though as some dialing codes have since changed!
Fax your plan to the nearest unit, worth telephoning a few minutes later to make sure it has been received and accepted. I've found Manchester the most helpful! Remember, you need only speak to London Info to activate the plan and not the unit you faxed it to, and remember to cancel it if you cancel the flight!!
Belfast (EGAAZPZX) 018494 22151
018494 22388 (fax)
Birmingham (EGBBZPZX) 0121 782 6232
0121 782 6143 (fax)
Cardiff (EGFFZPZX) 01446 711911 ext 2262
01446 711838 (fax)
Glasgow (EGPFZPZX) 0141 887 9319
0141 889 5693 (fax)
Jersey (EGJJZPZX) 01534 46111 ext 2231
01534 41094 (fax)
Gatwick (EGKKZPZX) 01293 575278-80
01293 575225 (fax)
Heathrow (EGLLZPZX) 0181 745 3111-3,3163-4
0181 745 3491 (fax)
Stansted (EGSSZPZX) 01279 669316
01279 669339 (fax)
Manchester (EGCCZPZX) 0161 499 5502
0161 499 5504 (fax)