The Good University Guide just ranked Durham’s theology program as 2nd in the UK behind Cambridge. While my knowledge is really only NT program strengths, I would say that’s a fair assessment.

For the non-UKers, the RAE (Research Assessment Exercise) is a national ranking program that analyses each department. I think the major grading factor is the number of publications by each faculty member. The Tarriff has to do with the A-level scores by incoming students. Durham just increased theirs to AAB (from ABB, I think?) Destinations is their assessment of those employed after graduation.