Holiday firm Tui has increased the coronavirus suspension period for trips into June

The company announced that all trips would be cancelled up to and including June 11, and warned customers wanting cash refunds that their call centres are "incredibly busy".

It had previously suspended its operations up to May 14.

Tui also cancelled its Marella Cruises sailings up to the end of June, and postponed the launch of its river cruises until late November.

The firm told affected customers that they will receive a refund credit for the full value of their holiday.

This can be used to book another trip taking place before the end of October 2021.

Package holiday customers will receive an additional credit worth up to 20 per cent of their booking.

Tui said customers who are "unable to accept" a refund credit can apply for a cash refund, but warned that its call centre staff are "incredibly busy" so waiting times are "considerably longer than usual".

UK laws state that full refunds should be given within 14 days for cancelled package holidays.

Consumer group Which? found that none of the UK's 10 biggest holiday companies or 10 most popular airlines are offering full refunds within the legal time frame, and some are refusing to provide refunds altogether.

Many travel firms are suffering huge financial losses due to the collapse in demand caused by the coronavirus pandemic.

The Foreign and Commonwealth Office has advised against all but essential international travel since March 17.