Well that is a huge relief. I thought I was going to have to include another step before sending in the visa extension application. That’s why this site is so great, although I do think the short period of panic I had in the interim may have taken a few weeks off my life!! Nothing like last minute oversights to scare the Bejesus out of ya.
It costs about £160 and can take several months to change the name on the BRP, so you wouldn’t have had time to get it changed anyway.
We actually recommend that if you plan to change the name on your passport, you do it just before you apply for your next visa so that you don’t have to send off for a BRP name change... which you have done anyway, just without realising it

I appreciate the reply to the name change question. If someone could please look over the document checklist too when you have a moment I’d appreciate it. 
I’m at work at the moment and on my phone so can’t look properly, but I will say that for the accommodation evidence all you need is:
- Land Registry
- most recent mortgage statement
- most recent council tax bill
There is no need to send 2 years’ worth of mortgage and council tax statements, only the most up-to-date ones (and you do not need any water bills for this section)... unless of course, you are using the others for your 4-monthly correspondence documents.
If you lived with your father more than 2 years ago, you don’t need a letter from him either.
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