Lumpy idle when warm

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Evening All,
1st post so be gentle with me.
We have had a 2006 C-Max with the 1.8 duratorq engine for a couple of years and it's been a great family car.
Recently when the engine is hot the idle causes the whole car to rock/shake, so much so it actually make the car an unpleasant place to be (freaks out son out).
Car has just had a full service to see if that could help, the garage added a fuel system cleaner to see if that would help, no change.
I've also cleaned the EGR valve and associated mechanism with one change.
So I was wondering if anyone has any ideas what could be causing this? Could it be something as simple as a worn out engine mount or something more serious?

In normal driving the car drives well and pulls strongly which is what's so confusing.
Thanks in advance,
Sent from my Mi MIX 3 using Tapatalk

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Is it a misfire type lumpiness or is it just the engine rocking if thelater then it could be an engine mount, your garage doesnt sound very helpful.

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