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The NOTAM can be found here - http://ukga.com/pib/view?pibid=L0120/13

NOTAM L0120/13
L0120/13 (OTH) London Heliport
N51°29.00 W000°07.00 1nm
Monday, 7 Jan 17:00 to Friday, 15 Mar 2013 23:59
Elevation: SFC - 800
HIGH RISE JIB CRANE (LIT AT NIGHT) OPR WI 1NM 5129N 00007W, HGT
770FT AMSL (VAUXHALL, CENTRAL LONDON), OPS CTC 020 7820 3151
12-10-0429/AS 2.

Other NOTAMs in the same location

C0071/13 (OTH) London City
N51°29.00 W000°07.00 1nm
Monday, 7 Jan 17:00 to Friday, 15 Mar 2013 23:59
Elevation: SFC - 800
HIGH RISE JIB CRANE (LIT AT NIGHT) OPR WI 1NM 5129N 00007W, HGT
770FT AMSL (VAUXHALL, CENTRAL LONDON), OPS CTC 020 7820 3151
12-10-0429/AS 2.

Also, these pages from the heliport may be of interest:

http://www.londonheliport.co.uk/londonheliport_enviroment.html
http://www.londonheliport.co.uk/londonheliport_pilotinformation.html