The Trades Union Congress have provided resource confirming the rights for employees and workers who have been furloughed.

The TUC confirms that ‘Bosses must follow the rule’…..
‘…Employers must use a fair process for selecting employees for furlough and be very clear about why they are making certain decisions.
They must be careful not to discriminate against particular groups of workers who are protected by equality law, either directly or indirectly.
Make sure you know your rights.
PAYadvice.UK 31/3/2020
For example, they must not choose to furlough a worker because their race or because they are pregnant, to do so would be direct discrimination. ….’