Alphasec Electronic Security Specialists phone Fraser House, PO Box 10A Didcot, Oxfordshire OX11 9LX map Piper Communications phone 4, Severn Rd Didcot, Oxfordshire OX11 0PW map if (!IN_DEV) { ?> } ?> Smiths Security Services Ltd phone Unit 4a, Hawksworth Didcot, Oxfordshire OX11 7HR map