The UK has the highest rate of autism in the world and vaccines aren't mandatory there.
Vaccines offered through the national immunisation programme in the UK are not mandatory. Vaccinations are also not currently mandatory in the UK during a pandemic. The Government took steps in 2021 to make vaccination against Covid-19 a pre-requisite for working in health and social care in England, with limited exemptions. These regulations, however, are set to be revoked, subject to parliamentary approval. For further information, see section 8 of the Commons Library briefing on Coronavirus: Adult social care key issues and sources (February 2022).