The message
from "keith_765" contains these words:

Ask the insulation contractor not to push the insulation up to the back of
the felt underlay, leave a 25mm gap from the felt. If the insulation is
pushed up to the felt underlay, the alternative is to fit vent tiles above
the height of the insulation every 1.6 metres both eaves to cause an air
cross flow.

Some of the houses round here which have had mucho insulation fitted
have these.

What about eaves trays?

--
Skipweasel
Pay no attention to that man behind the curtain.