How long do I have to enter once visa is issued?

[Strawfrawg]

My apologies for asking so many questions. This planning phase is quite complicated, I'm finding, and not all information is readily accessible on the UK.gov website.

Once my Family of a Settled Person visa is issued, how long do I have to actually enter the UK before it expires/becomes invalid?

[CR001]

Ideally you should enter the UK within 3 months of visa start date.

Please don't open a new post for every question you have.

[Strawfrawg]

Thank you, and my apologies. The other practical forums to which I belong prefer the opposite; they don't like multiple questions strung together in a single post. I will happily conform now that I know the expectation here.