Farmers drove dozens of tractors in a convoy towards Britain's parliament on Monday to protest post-Brexit rules and trade deals they say are endangering livelihoods and food security.

Supporters of the campaign groups Save British Farming and Fairness for Farmers of Kent rolled from southeast England and through southern districts of the capital, bound for Parliament Square, where dozens of supporters waited to welcome them.

Farmers from across the 27-nation European Union have protested what they see as unnecessary bureaucratic rules, clean-air and soil targets, and unfair competition from abroad.