Any suppliers of 12v UN38.3 Li-ion battery packs?

Does anyone have a suggestion for a UK supplier of UN38.3 certified 12v (11.1v), 8Ah, Li-ion or Li-po battery packs?
Tracer have none in stock and are selling that side of the business. They said its unlikely the new company will get any stock in before April.
We use them in our portable instruments that are shipped worldwide, so UN38.3 and less than 100Wh is a must. Iā€™m expecting an instrument returned today that will likely need a new battery and returning before Brexit :frowning: