Kev,
These are the pictures as promised. I think JMo was was spot on about there being little that can be done apart from removing the snorkel because the filter is on the inlet and not the venturi but here they are anyway.
OGR
Stock and DNA filter
Attachment 3076
Detached snorkel that faces foreward
Attachment 3077
Attachment 3078
The hole under the snorkel is a snug fit into the filter
Attachment 3079
Airbox top without snorkel - front is to left
Attachment 3080
Right side cover removed
Attachment 3081
Attachment 3082
There was about 30mm of oil in the bottom of the trap !!! This collected in about 2500 miles. Mainly from my 6 day trip to the Alps - 2200miles.
Attachment 3083
Attachment 3084
OGR