Law with Politics at QMUL or History and Politics at LSE?Watch
Law is more employable imo but LSE has greater prestige.
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Law is not 'more employable' and any extra prestige LSE in your mind has is irrelevant. Law firms see them as equally good and a sign that you're academically able. Chambers will see both as non-Oxbridge RGs (assuming that they care about university name and give each candidate marks on that basis - they may not).