Does law degrees involve a large volume of writing?Watch
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I would generally look at the weight given to essays at each of your universities of interest, as some might not require as many coursework modules etc, allowing you to effectively have less of your degree reliant on essay marks. If essays are a real weakness, I would perhaps reconsider given the significant weight assigned (probably at least 40%) to essays in both exams and coursework. Perhaps just see how you do with essays at A-Level, as I feel like GCSE’s may not be the best predictor of essay quality at university.
I was an UG at one of UCL/LSE/KCL and didn't have more than 4-6 essays per term, each of which was around 1200-1500 words long (with the occasional 2000 word long essay to mix things up). Oxbridge require a lot more writing given that you get weekly essays.
This might be changing now that 'alternative assessments' (e.g. 8-hour take home exams, summative coursework) are coming into play at many unis (including 'top' RG unis). This tends to be far longer, but it doesn't really matter, given that you have a lot of time to write out the essay and worry over its details.