Britain could launch its own satellite navigation system, as the country faces being frozen out of key elements of an EU project after Brexit.

Prime Minister Theresa May has asked the UK Space Agency to lead a taskforce of engineering and aerospace experts to draw up options for a British Global Navigation Satellite System with the capability to guide missiles and power satnavs.

The European Union has indicated that UK firms may be barred from bidding for contracts on its Galileo programme on security grounds, while British armed forces and emergency services could be denied access to encrypted signals.

Before the Brexit vote, Britain played a major part in the development of Galileo, a 10 billion euro (£9 billion) European rival to the US GPS system, which is expected to be fully operational in 2026.

But UK pleas for continued full involvement have so far fallen on deaf ears, and the project’s security monitoring centre has already been moved from London to Madrid.

Downing Street said specialists from the Government and private industry will take part in the new taskforce, with the goal of launching the UK system by the mid-2020s.