Ash Dieback has been reported near various cave entrances across the UK and care needs to be taken as affected trees can become brittle and suddenly collapse so think about those trees you use for belays and anchor points!
Ash Trees are native to British Limestone environments and with 80% projected to succumb to the disease so it may only be a matter of time before someone has an unpleasant surprise at a top of a pitch.
Here are some helpful resources on Ash Dieback from the BMC and the Woodland Trust. They include some helpful tips on what to look for so well worth a read!
The BCA’s Acting Chair has also released a statement on the matter.