Four weeks after buying my 2011 (61 plate) 2 L Titanium diesel whilst accelerating from 65 to 75mph the warning message came up along with a drop in power and the amber I!. After sitting in a layby for ten minutes the engine restarted without warning light and drove perfectly OK. I had a local garage look at it they found nothing. Two weeks later pulling a caravan uphill the same warning and loss of power this has happened again whilst towing and also whilst accelerating at speed. Should I take it to a Ford dealer? Any advice would be greatly appreciated.

Hard to say without some fault codes - have you got a means of reading them?

I had a similar problem with my 1.6 diesel, turned out to be the fuel filter needing replacing. 

Other than that, I would check all the vacuum boost hoses for splits - can you hear a loud hissing or whooshing noise when this happens?

I haven't got a code reader can you recommend one?

I was wondering about the fuel filter I have always used supermarket fuel and never had a problem but two days before the trouble started I was caught with low fuel and went in a station on an A road they had diesel at two prices I bought 10 litres of the cheapest I thought as I did it that it might be a mistake.

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That was exactly what happened to me. Ran the tank nearly empty, but I put in shell v-power like always. Still needed a new filter.

Not too expensive and fairly easy to do yourself if you've got the mind to.