Hi all, I've just joined and was hoping for some help.

I have a 1998 Mg MGF VVC 143bhp , the car has just underwent a decent amount of work.

* New engine
* New water pump 
* New thermostat
* New and upgraded radiator and fans 
* Bled a series of times from all three bleed points. Jiggle valves also appear to be free.

The car is back up and running, it idles fine but after 15 mins of driving it begins to over heat. 
I'm Currently in Northern Ireland and i was wondering if there's any MG mechanics still around as my mechanic cant figure out 'wrong. 

I've been told to replace the cover cap on the coolant reservoir incase it is leaking but it appears to be holding the pressure due to the build when it is released. My mechanic has said the coolant is flash boiling when its reaching the engine from the radiator.

Any ideas of who to call or where to go, Im not super mechanically inclined but I'm hopefully getting it back this week and if there any ideas for any things i could check whilst i wait that would be great. 

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