It's an Escort S2 RST MFI (KE-Jetronic) engine. Most common reason for an engine not starting when hot (but starting fine when cold AND runs fine when hot!?!?) are vapour bubbles in the fuel lines.

Injectors suffer from wear. It's always a good idea to change them. Plus leaking injectors are one cause for vapour bubbles. They're not that expensive. (About 30-40 Euros each, buy them as aftermarket parts, not directly @Ford)
There's a one-way valve on top of the fuel pump. These might stop working after all these years. It sits on the pressure side of the pump. When you take of the hoses and connectors, you can see the holes an a little spring inside.
You can't get these valves @Ford, but try at a Bosch Service Station. These engines/fuel pumps were used in many cars back in the days (Audi, VW, Benz, Porsche, Ferrari) and for many manufacturers these valves cost less than 10 Euros. Don't try to get one for the Escort RST as even Bosch probably won't sell the valves as single item.

EDIT: This is how the one-way valve looks like:

http://www.kurth-classics.de/wp-cont...e/dsc_2213.jpg

Depending on which part you get, you might have to change the hose connectors. When using different fuel lines, use high pressure ones for at least 10 bar fuel pressure!