What is my XYZ worth? How much is THIS worth? Value my...

Attached are the Freddie Grubb bicycle frame pics; afraid they're not the best shots!

I stripped the bike down to the frame as all the parts, including wheels were not original.

From the research I did, I believe it's a Freddie Grubb Silver Star 23" frame from the 1950s, the original paintwork most probably being a medium blue, hidden underneath the garish red paint job.
The BSA frame was hand built in London SE20, is steel with continental lugs. The serial number is 6109 M.

I hope the images and info help to gain some useful feedback with regards to pricing.

She was thinking of selling it on eBay, but I thought I'd ask here first, also, anywhere else worth posting it?

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