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Royal Engineers
The Sappers are the true jack of all trades going everywhere and turning their hands to pretty much everything. many other corps have been spawned from the RE such as the R Signals, REME and AAC.
The RE can trace their history back to William the Bastards invasion of 1066, a full 600 years before the New Model Army became the British Army.
Royal Engineers Regiments - Regular Army
21 Engineer Regiment - Close Support - Germany
22 Engineer Regiment - Close Support - Southern England
23 (Air Assault) Engineer Regiment - Close Support - Southern England
25 Engineer Regiment - General Support - Northern Ireland
26 Engineer Regiment - Close Support - Southern England
28 Engineer Regiment - Germany
32 Engineer Regiment - Germany
33 (Explosive Ordnance Disposal) Engineer Regiment - Southern England
35 Engineer Regiment - Close Support - Germany
36 Engineer Regiment - General Support - Southern England
38 Engineer Regiment - Close Support - Northern England
39 (Air Support) Engineer Regiment - Southern England
42 (Geographic Support) Engineer Regiment - Southern England
Independent Sub-Units
59 Independent Commando Squadron - Southern England
62 Cyprus Support Squadron - Cyprus (obviously)