Vaccines/learning disabilities: eligibility

I'm confused.

I've been invited for a 'flu vaccine even though I'm not within any of the vulnerable groups.

The invite states the '18-64 'at risk' group.

So, I just wondered whether autism is classed as a 'learning disability' with respect to this, as that is a 'vulnerable group' in the NHS list.

As far as I'm aware, autism is classed as a developmental disability but you can also have a learning disability with it.

Some do, some don't.

This has also set me wondering whether I will now be invited for a Covid vaccine on the same grounds.

Does anyone have any light to shed on this please (and has anyone else been unexpectedly invited to the Vaccine Party)?

Thanks.