loft condensation

[Jimboqwe]

Since having cavity wall insulation installed, I now have a condensation problem in the loft. Never had it before. Nothing else has been changed. Is it likely the two are connected? If so, any ideas how to fix the problem. There is no additional ventilation fitted. Eves ventilation always been good enough in the past.
Any advice appreciated.
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[markie]

I would put tile /slate vents in roof, since you got your walls insulated the heat can't escape through the walls it rises into the loft and the heat hits the cold surfaces and condensation forms.

 

[Jimboqwe]

thanks markie
Will investigate your suggestion.
Have spent today in the loft clearing the eves. All blocked by cavity insulation material. They don't tell you this might happen when they pump it in!