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[adrianw]

An eBay search term of Dantech PSU ("12 volt","12v") , ("4 x 1", "8 x 1") seems to do the job. Surfaced a vendor who seems to be in the security industry with two "buy it now / best offer" DA396 (1 x 4) sales, and currently (after I've bought a couple to play with) there are a pair of scratched ones for £21.90 and 8 good condition ones for £14.90 apiece. The seller does have a bit of negative feedback.

Leaflets and data sheets for this range at http://www.dantech.uk.com/DA391.html

Yuasa NP7-12, 12V 7Ah Lead Acid Battery NP7-12 seem to be from £15 to £20 pounds. I've bought a couple for £33 including shipping at https://www.lampshoponline.com/yuasa-np7-12-12v-7ah-battery.html

I hope the wiring of the battery is obvious.

[burakkucat]

Yes, after a brief look, I believe either the DA391 or the DA448 would be suitable.

I presume you have already performed the calculation for the VA load versus time, etc, for BBU purposes.