I teach at two universities here in London (they were both former Polys) and I teach a class for the Open U. The Open U is not the answer for you, unfortunately because of their policies. Plus, you'd be all on your own. All the unis in the UK are desperate for money from international students, so depending on how low your gpa might be, you might want to even try applying to your dream university (as long as it's not Oxford or Cambridge) in addition to the less competitive ones. I did my MA at King's College, University of London back in the 80s and my gpa for my BA was pretty average. I do remember having to send transcripts and possibly even letters of recommendation.
pcb