Thompsons has been dragged into the row over compensation for sick miners, with the top trade union adviser this week admitting it was being investigated by the Law Society, while new figures revealed the firm had received £83.7m in public money.

The firm conceded that it was facing investigation by Chancery Lane for its role in advising thousands of sick miners in the £7bn Government-backed compensation scheme. The national litigation specialist is one of a number of firms to face scrutiny after claims that a substantial group of solicitors cheated thousands of miners out of payments owed to them under the scheme, believed to be the world’s largest personal injury scheme.