I went looking for information on explosive compounds used in WW2 bombs and aparently the british used Torpex explosives heavily in bombs. This in an assumption as I only found a site listing it as the explosive used in the tallboy and grand slam bombs.
* Name: Tallboy
* Type: Deep Penetration Bomb
* Length: 21 ft (6.4 m)
* Diameter: 38 in (0.97 m)
* Weight: 12,000 lb (5,443 kg)
* Warhead: 5,200 lb (2,360 kg) Torpex explosive
* Number Used: 854
* Name: Grand Slam (Earthquake) Bomb
* Type: Deep Penetration Bomb
* Length: 26 ft 6 in (7.7 m)
* Diameter: 3 ft, 10 in (1.17 m)
* Tail Section length: 13 ft, 6 in (4.11 m)
* Weight: 22,000 lb (9972 kg)
* Warhead: 9,135 lb (4144 kg) Torpex explosive
* Number Used: 41
This info is from here
http://www.ww2guide.com/bombs.shtml and here is an description of Torpex
TORPEX
TORPEX is an explosive based on trinitrotoluene (TNT) that gave a greater blast than TNT, but was more sensitive. It was replaced by HBX or HBX-1 later in WWII. Torpex is RDX/TNT/Aluminum/Wax desensitizer. It was used in several types of torpedoes and mines. Due to it sensitivity to bullet impact, the first weapons loaded were ones for which there would be the least possibility of rifle bullet and fragment attack, namely, submarine delivered mines and torpedoes. The loading stations were advised that they must take adequate care in mixing and loading and in the handling of the loaded items. It was declared that the British had been able to handle it without incident for 2 years and that the risk was worth the advantage gained in its underwater power.
from this site
http://www.globalsecurity.org/military/systems/munitions/explosives-compositions.htm Anyway I hope this helps some what