Apollo folding bike (BT15)

same model as this one on Gumtree:
https://www.gumtree.com/p/bicycles/apollo-folding-bike/1407323501

-bit of a monkey-paw this one.

The good:
small; I guess about the size of a Brompton - can be brought onto trains, buses & coaches when other bikes would be restricted. Can be thrown into the car easily & save on taxi-fare if leaving the car at the garage.
mudguards, chainguard, rear-carrier
mechanically in adequate order.
Tyres & brakes are good
"ding" bell
stand
folding-pedals
working brakes

The not-so-great:
heavy (~15kg I think)
lots of cosmetic surface rust
single speed; tops out at ~15mph with high 'cadence' pedalling, so not great for road use
Chain's rusty; probably should be replaced, or at the very least oiled (I've not oiled it just now as it would make replacing it more messy)
front brake rubs a little - probably needs some v minor fettling

A good many years old.