Probably best to speak to Pete or Pete for official confirmation, and I expect they'll post when they have 100% confirmation of no problem themselves, but between what Don and Mick have said, the fire was miles away, they've probably had to close the ranges while they work in the danger area (fire burnt for 3 days), but the BFTO ranges point away from that area, and are no where near. The fire was apparently in the Danger Area for Stickledown, some 600yds + and beyond the car park in the opposite direction, so I would think it would be on... but do check.
The website people are looking at is for the loud bangy things, which generally point in the direction. www.bfto.org.uk
is the FT/HFT website.