thanks chaps that's pretty convincing, also your information lead me to this:
https://www.google.co.uk/url?sa=t&rct=j ... 0881,d.ZGg which is the same bike maybe larger, stated as corsair too
I have the bike mostly stripped, except for bottom bracket and headset as I don't have the correct tools, nothing was seized
I think the frame should be sent to a specialist, the rear brake mount has come loose in the seat stay bridge, as you can probably tell from the angle of the rear brake in my photo
the crank cotter pins will need replacing, the bike looks like it was ridden with a loose crank, so wore a big dip in the pin, the other looked like new but I damaged the thread when bashing it out, I also noticed the screw thread on them gets thicker as it goes along, I wonder why this is?
as for the rest of the components, the bike wasn't washed much which thankfully lead to a layer of oily gunk protecting them from rust, there's still a fair amount of speckled surface rust so I will have to get them sorted
this is my first bike restoration so I would love some advice from those who have done it before,