Bert Coules wrote:
Ah, I've just discovered these Lever Wire Connectors on the Toolstation
site, which seem to be made for the job.Â* A pity to buy a multi-pack,
though; I'll see if I can find them available singly.

screwfix sell the 'kosher' wagos, but still in large 50x packs, you can
get the genuine ones in smaller 20x packs, or an assortment, not sure
how well in works out with P&P

http://secure.wago.ltd.uk/index.php?rt=product/category&path=68_69_72

or singly from here

https://www.connexbox.com/shop/connectors/wago-222-412-2-port-lever-cage-clamp-terminal-block.html