Hi Colin.
Are you resident in the UK? If not then I would not think it possible. UK Banks are for UK Customers - There would be too much of a fraud risk if they started offering mortgages to overseas customers. Thats why companies like RBS have bought into mortgage companies in Dublin - so they can get a foothold in Irish Mortgage business.
The criteria for 100 % mortgages in the u.k is similar to here - If you are in a certain profession such as doctor, vet, lawyer, etc then you can get a 100% mortgage from various institutions in Ireland.