BRP Renewal for Leave to Remain - Not ILR

I apologise in advance if my first post isn't in the right place or may query something that I have missed in another thread.

I am a UK Citizen and my wife is a Taiwanese national. We have been together since 2014, she came to the UK in February 2017 on a Fiancée visa and we married in June 2017. We applied for Leave to remain in August 2017 and received a BRP marked “Leave to remain” with an expiry date in [now] about 1 years time - its valid for 33 months. She is very well organised and is worried about the renewal of this as she thinks we need to provide evidence that we have lived together throughout the period of the BRP, but unfortunately as she doesn't work, she had no bank account, no bills, no NI number, no UK driving licence or other qualifying letters during the period of September 2017 until October 2018. The Home Office website is vague about this, it seems to give information about requirements for initial applications, with not much for renewal requirements other than new biometrics and the ambiguous “…If they meet requirements…”.
I have searched the internet extensively, which led me to this site. If anyone has had a similar experience and can give us a clue, it would be very helpful!

Thanks in advance,

Paul

She applies for an extension on form FLR(M) which is now an online form.

Page 63 of the old paper form tells you what HO expect to see.

https://webarchive.nationalarchives.gov ... -form-flrm

Okay, that's really useful.

Another £1,033 and another healthcare surcharge too. I'd better start grabbing overtime!

Thanks for your help,

Paul

Yup, and health surcharge was increased in January so it is the visa fee plus £1000 IHS.