After a little more research I have now found it maybe the Red-belted clearwing (Synanthedon Myopaeformis)
which is native to Europe. I hope someone can confirm this and whether it should be reported as a pest?
No - the peach tree borer is much darker, as shown here, for example
So no scientific discovery today!
Your moth is a red-belted clearwing, Synanthedon myopaeformis (female).
The pictures here all happen to show males - considerably more slender of body than the females
You can see both sexes here
skip the photos and search/scroll-down to 'Diagnosis' to see male and female side by side
(I suggest you use Google Chrome and its built-in translation, though that might need enabling).)
Note that there is no pale orangey flush at the base of the forewings. If there had been, it would have been
large red-belted clearwing, Synanthedon culiciformis - http://ukmoths.org.uk/show.php?id=5170
It would be interesting to know if you are in the southern part of Britain (its normal range).
Our postings crossed...
Curiously, DEFRA does not include many moths in its notifiable pests section
And it actually lacks a section for adults; it has one for 'caterpillars'.
Similarly, there is not much by way of moths here
Elsewhere (eg. the RHS), I can find no mention of clearwings being reportable pests in the UK.