That's a beautiful bike with some very collectible and valuable bits on it...Chater Lea pedals. Alumite rims. Wow.
You can find out much of what you want to know on this website. They won't give you a value for the bike but you'll find out all the info you'll want to know.
http://www.classiclightweights.co.uk...welded-rb.html
That bike is likely worth a thousand in parts alone. It's a shame the paint and original finish are gone but you could restore it to it's former glory.