OK,

I moved into my house about a year ago. I insulated the half of the
loft in January with the orange and silver kauff insulation from B and
Q, the other half of the loft was alredyinsulated with rockwool (with
no orange / silver covering) and put a box up there a week ago, a week
later I got the box down and it was damp.

On closer inspection I can see a bit of condensation on the roof felt
at the apex. Having read a few posts on condensation etc I have noted
the following which is probably contributed to this.

I have no door on my bathroom, have fitted a new mira excel shower off
the new combi boiler in there, the foft hatch is just outside the door.
I have no extractor in the bathroom.

There are a few holes in the ceiling where there were pipes to the
water tank which is now redundant.

In the bathroom I have spotlights which have a small gap around them
where they can pivot.

I have no "vapour barrier" in the loft.

In the year I have had cavity wall insulation done which goes right up
to the apex of the gable ends.

There are no air bricks in the loft, but there is a good flow of air
through there (I can see the cobwebs quivering in the wind) I didnt
insulate into the eaves.

Obviously I want to solve the problem. HOwever I am just after some
opinions as what to tackle first, some soloutions are easy (bathroom
door!) some are harder (bathroom extractor) and some I'm not convinced
will be a major benefit (I dont know anyone who put down a vapour
barrier under their insulation)

Also does the polythene around my new insulation not act as a vapour
barrier already?

I'd appreciate any ideas on what I should tacklle first / how to
approach this.

Thanks.