I got an offer to invest in a convertible note that is also supported by the UK government, whatever I invest is matched by the UK government. They are promising 8% pa for 3 years (not compounding) and a redemption premium (e.g. extra $50,000 on maturity if I invest $50,000).

I'm new to this and there is legal documentation and the like. Is this safe, and what happens if the company goes bankrupt, I wouldn't see a cent would I?

There are cash flow and revenue records and it all seems good from that end.