I have joint tenancy with my boyfriend. When we applied, I gave them letters saying what a wonderful tenant I am, a copy of my loan approval that showed my how much I'd be getting, and a few miscellaneous things like that. Adam provided all the stuff they wanted -- phone numbers of previous landlords, employment history, etc.
The combined application was suitable and we didn't have any problems getting our first choice place.
I think the biggest thing was proving that I had financial resources and a good tenancy history. With those, they didn't mind that my credit check came up completely blank.
You could have it in his name, though. Adam's last place in London was just in his ex's name because he knew things were going to end and didn't want to be liable for how badly she took care of the flat.