Diamond-back Moth influx

I didn't run my moth trap on Monday night but saw that there were large numbers of the Diamond-back Moth trapped on the East Coast from Shetland down to Norfolk so ran the trap last night and caught at least 15.
I usually only catch one or two each year and it has featured before on the blog, although they are generally rather darkly coloured whereas those involved in this influx are pale.
They have clearly crossed the North Sea from the east as there are few records on the South Coast which is incredible for this tiny moth which is less than 10mm in length.
Why huge numbers should cross the North Sea, all at the same time, is one of those mysteries that make wildlife watching so interesting and unpredictable - even in land locked Derbyshire!

Diamond-back Moth, Plutella xylostella