Here is the UK gov Hydrogen strategy that also has a recent update on the market: https://www.gov.uk/government/publications/uk-hydrogen-strat...
Hydrogen strategy update to the market: July 2022: https://assets.publishing.service.gov.uk/government/uploads/...
They (the UK gov) also have a portfolio of companies, they have invested in, that you can have a dig around for if u checkout current and previous Innovate UK funding rounds.
Probably worth checking out similar programmes from other tech focused government investments (US, Germany, etc.)