A FOURTH Scottish Tory MP has turned on Ruth Davidson, joining with the extreme Brexiteers of Jacob Rees-Mogg’s shadowy European Research Group to call for the hardest of Brexits.

In an astonishing letter sent to Theresa May last Friday, and leaked to the press last night, 62 Tory MPs called on the Prime Minister to break her agreement with the EU over the transition period and to quit the customs union and single market.

These included Scottish Tory MPs Colin Clark, MP for Gordon, Alister Jack, MP for Dumfries and Galloway, and Stephen Kerr, MP for Stirling.

However now Ross Thomson, the MP for Aberdeen South, has added his name to list of hardline Brexiteers.

READ MORE: Scottish Tory MPs defy Ruth Davidson to demand devastating Hard Brexit

In a statement released on Twitter he stated: "I wholeheartedly back this letter of support to the PM which gives power to her elbow in these crucial negotiations to achieve a clean #Brexit. Out of the Single Market, out of the Customs Union and delivers a special economic partnership with the EU that works for the whole UK."

The letter, offering “some suggestions” to May, also demands the Prime Minister adopts “full regulatory autonomy” outside the EU – effectively, rejecting any laws made in Brussels between Brexit day on March 2019 and whenever Britain finally leaves Europe.