Thank you Lanky Lass!
Can't believe it either.
But I know this is such an interesting machine.
I've got it here now and it looks better than on Ebay.

The saddle (worn) is an Lycettes Aero Elastic.
The wheels are steel, but are painted with a blue and green stripe in the centre (where the brakes don't rub) and are obviously original.
It has excellent mudguards, with original green lining, and front forks which don't have drop-outs, just holes which you have to stretch the forks to fit/remove the wheel.

Will post some good pics tomorrow for all to see.
(Had my grand-kids here today and all was confusion!)

I am absolutely convinced this is my best find to date.
And cannot believe that nobody on BF has any info on this lovely machine.
The chain-wheel is a classic art deco period design.

Not checked your link yet but will do so now.

Many thanks: )