Supporting letter for my partners leave to remain extension

[Bbk]

I need advice guys please.Hi we have 2 British kids and my unmarried partner is applying to extend her 2.5 yr leave to remain on FLR(FP)
Any ideas or advice on how the supporting letter from me should be written. Do you have any samples to share with me.
What points should I raise in the letter?
Your advice is really appreciated

[Casa]

You aren't required to submit a supporting letter for FLR(M).

[CR001]

There are no template letters or a 'one size fits all' letter.

You need to write a letter if you are providing about your/partner personal situation etc.

What did you write in the first letter when your partner originally applied?