Hi Iain you can send off for the multi entry visa to the Egyprian Consulate in London. Cost is £18 and you need 2 passport photos and stamped self addressed envelope.
Please note that the Consulate in London is shut Friday 25th April and Monday 28th April also 1st May.
Opening hours for this are Mon to Fri 9.30 - 11.30 and if you want to collect in person 2 - 3 days later between 15.00 and 16.00pm.
You can dowload and print off application form here
http://www.egyptianconsulate.co.uk/