101 (City of London) Engineer Regiment (EOD&S) is the British Army’s only Reserve Explosive Ordnance Disposal and Search unit. Headquartered at Hudson House in Catford, London, the regiment operates under the command of 29 EOD & Search Group and works alongside its Regular Army counterparts (33 and 35 Engineer Regiments) to provide specialist counter-explosive capabilities. The unit is tasked with high-assurance search, munitions clearance, and counter-IED support, utilizing highly trained reservists who often deploy to support civil authorities in the UK or military operations overseas, such as Operation Tosca in Cyprus. Its sub-units are primarily concentrated in the South East, including 217 Field Squadron (Ilford), 221 Field Squadron (Catford), and 579 Field Squadron (Tunbridge Wells), all of which maintain a unique heritage linking back to the historic London divisional engineers.
