I get that you're worried about prospects, but you shouldn't try to squeeze out answers from this forum when nobody has one. The truth is, the glut of graduates is unprecedented and nobody can tell how each individual will fare. All we know are anecdotes and bits and pieces of hearsay here and there, and make semi-educated projections about prospects for future graduates based on this.

Here are some harsh words for you to hear, but you need to hear them.

If you're returning with an Oxbridge degree, you're in good stead.
If you're returning with a higher to mid ranked OSU degree, you're on par with the NUS/SMU students, even better if you can get a First Class, which is relatively easier to get in the UK.
If you're returning from a lower ranked OSU, you need to cast your net wider than the bigger firms.
If you're returning with the lower end of 2:1 from any OSU, you should question your aptitude for law, and seize on anything you get, even in the smallest of firms.