I have been buying and selling bikes like these for the last few years. My supply was a guy who had the tip tender, and at the time, he couldn't keep up, I was paying between £5 and £15 per bike. I've had Ribble, a Raleigh Gran Sport, high end Peugeot and Raleigh....in fact my garage currently has around 60 bikes in it awaiting tlc, or the prices to rise.
Someone else seems to be getting them now, so I'm having to be a bit keener on timing and price, but the turnover of bikes is amazing, a lot of the 'modern' stuff goes straight to a local'ish auction.
I also have a scrap man who phones me, I've had Skyway BMX wheels, and the other day an old Vindec which I haven't really looked at properly, but it's rough.
The theme with most of the bikes is knackered tyres/buckled wheels/snapped cables/scratched paint, but I can live with that. One day Rodney we'll be millionaires