I messaged his M back yesterday and explained I was only on short breaks at work, and that I was sorry but wouldn't be around much yesterday.
I got a bit of a snippy answer back, presuming that I might be 'around' sometime for her to pick up his mail from me.
I texted back and apologised again for not being able to have much time for texting. I explained that I think there might be something from the car insurance people for him, but I wasn't sure what, or when it had arrived (maybe a couple of weeks ago? Or a couple of months ago?). I genuinely can't remember.
I suggested posting it to her at her own address.
And she replied, apologising for what she'd written and also offering me a piece of work (I've worked for her on a freelance basis for years now).