Workaway in the UK - VISA

I am from Austria and would like to do workaway in the UK. I am not sure which visa I need and the embassy in Vienna is not helping me. I have already enquired online about what visas are available. In principle, the visa would not be a problem, but there are still very high costs for the health care system (I don't know what it's called exactly). Around 1000€. But as I only want to stay in the uk for 1 to 2 months, these costs are very high. I am therefore hoping to find someone here who has experience of this or who has recently done a workaway in the uk. I have also heard from some people that they have done this with a tourist visa.