~ "Derby". DE73 7HH
[Just North of Barrow-upon-Trent on Sinfin Lane].
Sensibly priced refills (true 300 BAR) and amongst the cheapest for cylinder tests (£6 visual, £24.50 for a full Hydro)
The details are already embedded in the map, you just need to enter "Dive Cellar" in the map search window.
Always worth calling first, the "shop" isn't always staffed, but the owner lives next door and can be there in a few minutes. HTH