Hi Danny,
Yes, HSE licensed site but a proposed new burning ground/testing site, previous prescribed distances etc. not a problem when they were shown on the original license however, the original license only required distances to Class1, 2 and 3.
ER2014 now requires distances from A - H.
The original document providing this information, produced by EIG only lists:
(a) Recommended safety distances to inhabited buildings and,
( Recommended safety distances to factory or magazine buildings
This document therefore only enables two options and not eight as demanded on the building schedule created by the current regs.
More up to date guidance published by HSE provides 6 tables - 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.3.6 - not much use really as they refer back in some instances to diisposal operations in which the material undergoing disposal is compared to TNT equivalent.....really helpful when you're burning off flashpots, roman candles, thunderflashes etc! In any event - they don't provide data which can be used to address the eight classes listed on the building schedule.
Some deal with fireballs which presumably sit somewhere between hazard types 3 and 4 - but don't mention HT's 3 and 4. All with a cop out at the beginning excusing responsibility and passing it onto the applicant. The scenarios simply do not apply or corrulate to the hazard types demanded by the licensing authorities - it's up to the applicant to make a relevant comparison and then, the comparison is highly subjective and open to debate.
There are distance tables for all hazard types with a range of weights for storage/manufacture. It beggars belief that disposal "guidance" can't follow the same pattern - before anyone says it simply can't for whatever reason I would say it can and it previously did to the satisfaction of the Explosives Inspectorate.