I've been trying to do some research for us all, but come up with very little.
There is some inforamtion that is probably useful at
http://www.faa.gov/atpubs/NTM/index.htm
I've been able to view NOTAMs for the LONDON FIR from
http://www.phd.nl/aviation/wx/ and in there I can see references of the style H3862/02 with a reasonable textual description of the NOTAM e.g.
H3365/02 - (MIL REF) AUS 02-08-0097/AIS 2027/VL PJE 1.5NM RAD 5311N 00017E SKEGNESS SFC 5000FT AGL 01 AUG 18:55 UNTIL 29 AUG 19:25 TUE AND THU 1855-1925 DAILY
The PJE means Parachute Jump (got that bit from the FAA website above.)
Will keep looking as it does appear that none of us know enough!