The No. 7 building at the GSK site at Powder Mills - a link between Bridge Chemicals and the original Old Powder Mills which operated there - ended in a pile of dust and rubble. In places its walls had 27 inches of solid brickwork and it had survived a fire - after being struck by lightening in 1917 - which was so fierce they say you could have read a newspaper in Tonbridge High Street by the glare!

The building dated from the first world war when nitro-cellulose and similar explosives were made at the Old Powder Mills, and No. 7 was designed to house an ether recovery still. It was a five storey building and, after the damage done by the fire had been repaired, it continued in use for explosives manufacture until the 1930's.

When GSK aquired the Powder Mills in 1950, No. 7 was unsuitable for anything but a general-purpose store. It was finally demolished and the site has been retained as hard standing for an open air Barrels Storage Compound.