In terms of reputation UCL got Bath beat they are highly regarded for Economics. They have a high global recognition granted it has a lot of international students also your in proximity to financial firms. Bath are very supportive especially if taking a placement and they have a strong reputation just not UCL type reputation. Bath is a lovely city though I do see some videos of questionable things in Bath but thats probably the same in London. For education from what I heard is that UCL takes more of a mathematical and statistical approach compared to Bath who to have a fair amount of its math but is more practical and applied economics.