Same problem happened to me also. The moment we rolled off the ferry to France the gauge went up to near the red, and stayed there until we returned to Blighty.
Tried all the things you tried, but never found a fault. Never had any probs with engine blowing up either.
Worth noting that the first thing to go for us when driving in soft sand in temps of > 50 degrees Celcius (Wadi Rum, Jordan) was that the fuel vaporised in the line somewhere around the fuel pump and so no fuel got through. Tie a wet rag round the fuel pump, or just stop for a while...
Any more Qs let me know
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