I think this might be one left to the respray boys. All the repaints I've seen so far have been exceptional and have looked after the grab iron removal...
Keep an eye on RMWeb for chassis units. There was a 37 up today but it just sold. Been a few recently. Vitrains might be an option for you too. Their 37 is cheap and runs really well.
Later Lima and current Hornby Railroad class 20s have plastic bogies. Hornby one has the best motor, DCC ready too. If you go upmarket the Bachmann one is a great runner, but it would be hard to hack up the chassis being diecast etc.
Currently in administration. But then lots of companies do it to get cheaper rent etc. and come out the other side. HMV being one high profile example. Modelzone and the signal box have been linked for some years now.
DRS have been using pairs of their Class 37s on one of their regular container gigs over the past week or two. Sound awesome. Some videos...
Gotta love tractors!
As Ben says yes they do. Too many things running around with 645s in them to this day not to. Parts for the 567 engine as found in 121s and 141s are still being made, and the 567 was first introduced in 1938!