I’ve given it some thought (around smoke/fire alarms going off because they also go off when they lose mains power - and an RCD triggered) and, because I’m really only wanting it as a spare, or pare parts, for my much loved MP should it ever need them as it gets older, I’m not prepare to go above £150.
I totally realise that’s a very low price (I did warn you. 
), but - for me - that’s all it’s kind of worth.
But - at least you have a second person that would like to keep it in the club queued up.
Let me know. 