I've recently dissected a specimen of this species which I found in a friend's garden in Cathays (ST1777) in May 2014. This appears to be the third county record, and interestingly they are all from adjacent squares in this very urban part of Cardiff. I've dissected a few Mompha divisella/bradleyi from my current garden and all have been divisella - and looked like it too, with a broad white basal streak. The Cathays specimen was darker with an interrupted basal streak (shame I don't have a photo), which made it look a bit different from typical divisella. So, if you catch an odd looking 'divisella' it'll be worth hanging onto it.