The performing arts practitioners union Equity, has a benevolent fund that is accepting donation and claims (from all members). Members can apply to cover living cost in emergency, ranging from £60 – £350:

The Coronavirus epidemic is an unprecedented crisis but we will get through it by facing it together.
Thousands of entertainment workers have lost their jobs and are in dire financial need as bills are beginning to mount up. Despite the public perception, the vast majority of performers, stage managers and creative practitioners working in the entertainment industry earn modest sums and this sudden loss of income is devastating.

They also have a very comprehensive guide to financial support during this crisis on their website: https://www.equity.org.uk/about/coronavirus-advice/financial-support/

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