Because the fee and funding structure for next year is completely different to what the OU have had previously, it's tricky for anyone to say with any certainty how it works, because no-one's experienced it yet in relation to the OU. As a general rule, students at brick unis can get funding for a year's 'false start', so if they find they've made a horrible mistake, all is not lost. At a guess, something similar would probably apply if you were to do what you plan - but the only way to know for sure would be to ring up student finance and run your plan past them, in which case I'd perhaps phrase the conversation more in terms of "if I were to start with the OU and then feel that it's not for me and I'd be better off at a brick uni, would I be able to do this..."