As long as you know that you will only get 5 years of funding from SFE. So if you do the 4 year option and then decide to change courses you may have to fund the first year of a different course yourself.
I did a 2 years part time IT Certificate and applied to do a 4 year IT Bsc degree course and was told I would need to find the 1st year money myself but luckily the placement was optional so the ucas code was classed as a 3 year course or I would have to find £9000 or find a 3 year course. So be sure