Colouring pencils, I do hope experience of someone who has been through the process is helpful, even if not everyone agrees. I received huge valuable help when DD was applying from posters who had been through the system, including a couple with trenchant views (whatever happened to Petrenas?) with very kind and constructive suggestions, some of which made all the difference, and others that went into forming Plans B & C. DD got a poor UCAT, and we were struggling to find places for her to apply and it was tough. I also hope that some diversity of view is helpful. Mumsneedwine and I disagree on a few things, which I flagged up when I mentioned intercalation, but heyho. If there were only one set of priorities, applicants with uniform results and talents, and one set of course the whole thing would be not be as confusing.
(Bimkom, I understand that post grad loans are available, and there might be specific ones for medical related subjects. The advantage of doing the academic year as an undergraduate intercalation is that you get student loans for 4 years and then the NHS pay fees and a small grant for the remaining 1 or 2 years. Ie you don't have to pay fees for the extra year. Also some intercalations are Bachelor and some Masters. I am not sure if you can do the Bachelor ones later as a stand alone.)
Another thought on costs. It is common for medical schools, either via outreach, foundation years, or similar to seek to recruit local students. I understand that they are interested in training doctors likely to stay in the area. This means that there will be plenty who live at home. It does not seem to make a huge difference. You might spend the first year in hall, a typical London approach, but med students have lots of contact hours, and are together on placement, so get to know each other quickly. There are also a host of medic societies. It is worth looking closely at local medical schools and seeing if there is a fit. There has been a huge expansion in the number of places so it ought to be easier.
My further advice would be to consider making it a two years process. Not least places do open up during the summer and people who were rejected earlier can be reinterviewed, especially if they make the grades. (My instinct is that as this is the first year of everyone using UCAT, things could be quite fluid, with more than usual ending up in clearing.) DD eventually had three interviews in March, which resulted in two offers. By then she was already so invested in planning her gap year that she asked to defer.