Top shareholders of London-listed firms are pushing back on takeover bids this year amid concerns buyers are capitalising on low valuations to pick up companies on the cheap.Foreign buyers have targeted companies across the London Stock Exchange this year including FTSE 100 firms Schroders, Intertek and Beazley. Retail investment firm AJ Bell said it expects the total value of live or completed bids to hit £69.3bn by the end of 2026.Analysts hav…