I live in the US. Normally, when I go to the UK, I leave my extra gear at a relative's in Eastbourne.
This year, when I'm going to do the second half of my LEJOG, I had hoped to do the same; sadly, this relative is doing poorly and may be in hospital, and I don't want to be an extra burden on them at that time.
So I may need to find alternate arrangements as far as a place to assemble my bike (it's got S&S couplers on it) and leave my gear for about 5 weeks (the amount of time I'll be in the UK/Europe).
I asked on the Cycling UK forum if someone knew of a good temporary storage location I could use for this purpose; someone on there suggested asking folks on Warm Showers... I'm a member, tho' I haven't ever used it before; I hadn't thought about that, since I don't want to be a bother. But I thought I'd ask here, to see if anyone's done this before.