I've prepared a list (xls) of all the funding deadlines for 2010/11 that I could find.
The spreadsheet is split into two worksheets: one for open deadlines, for which you can apply anytime, the other for set deadlines.
Click on the tabs at the bottom of the spreadsheet to access the different lists. For the set deadlines, a rough indication has been given of what faculties may be interested in each funding scheme. You can ‘filter’ the list using the arrows at the top of each column. So, if you just want opportunities offered by, say, the Wellcome Trust, you can tick ‘Wellcome’ on the filter. Alternatively you can filter by colour on the faculties columns to select only the opportunities relevant to your faculty.