In my experience, the visa officer was more concerned on the validity of my marriage rather than my funding. I had taken a small album with about 40 pics and he went through almost all of them and asking questions in most of them, such as where was the ceremony? Who is this? Was it an arranged marriage? and so on. Luckily we (me and my wife) had applied together so I answered all the questions. So if your expenses are covered by grants, then I think it shouldn't be much of a problem.

Sparty