The pack is a bit expensive but there are loads of different lubs... one must be right for us!
poliss
There's a cheaper one at the bottom of the page if you're hard up.
MaGeR Lubricating Oil (LO) Price: £3.40
upnick
The woodland scenic Teflon white look ok from woodland scenics anyone had experience of it ?
My local model shop did sell them at one time ... think Antics is a good bet to get some if its suitable for plastic gears.
poliss
I found a source for LaBelle. Model Junction, same place I bought my Big Boy from. Should be the perfect lubricant for all models.
https://www.modeljunction.info/estore/