Fuelling Issue when the 200tdi gets warm?

Hey guys I know it has been a while since I was last around. Life seems to be throwing as much at me as it can and The 110 has developed an interesting issue I hope you can help me with.

I put a discovery 200 tdi engine into the 110 and until a couple of weeks ago all was well. I have probably only covered a 100 miles or so since the rebuild finished but they were problem free engine wise.
Now though the engine runs fine when cold but as soon as it gets up to normal running temperature there seems to be a fuelling issue as in there is not enough going through and the engine coughs, splutters and barely moves in first gear.
So far I have checked all of the pipes which are fine as well as the connections on them. The lift pump was new and seems to be doing the job. Fuel is getting to all of the injectors. No signs of the head gasket going. Intercooler is not blocked. I have bought but not yet fitted a fuel stop solenoid but the old one does cut the engine out if you remove the wire.

Have any of you top fixers out there got any ideas at all? I am just plain stumped!

Just because lift pump is new doesnt mean its any good, but a 200 will run with a duff lift pump and will still do 60 it just takes muuuuch longer to get there.
Im not sure how the temp can effect it and the only thing that really gets hot is the injector pump itself, so you might be on the right track with the solenoid.

if soloniod all right ihad a problem with old hymac would not start when hot cool pump down with cold water started straight away also had same trubel with pump on dawoo not very likely your problem but interesting to prove solodiod you could take valve out of soliod and see what happens you could run separate live wire with fuse direct from battry to soloniod I don't suppose in let hose is startink to collapse when warm does it start to smoke when proplem starts

Solenoid replaced and it made bugger all difference!
Checked all hoses and lines in. One was at a bit of a tight angle so I have moved that "just in case". Turbo waste gate moving freely and I cannot find a sedimenter on it anywhere, suppose someone else has already removed that.
It is once again ticking over ok but I need to take it for a drive to get it up to temperature once again and see if the problem presents itself again.
It is going up for auction shortly but if I cant find the fuelling issue it will be sold as is. Bloody shame to be selling it but I need the money so teh toys are the first things to go