"Cork winged twig" on elm. Is this caused by a virus or perhaps Ulmus Thomasii?-
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There are many young elms in this area, and they all have those corky wings.
My memory tells me that this is a natural feature of elms stems.
I also think it might be a feature of Field Maple - perhaps.
"There are no trees in Orkney" Darwin
...occur in three trees (at least), two of which are commonly found out and about in the UK.
The common ones are Field Maple (Acer campestre) and Elm species.
Easy to tell the difference: Elm have alternate buds, as seen above, whereas Field Maple have opposite buds, ie in pairs opposite each other.
The third one is really obscure, it's a corky variety of Liquidamber that cropped up here a while ago. For comparison, check it out: http://www.ispot.org.uk/node/314694
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
... (Euonymus alatus) to the mix.
[And I saw a plant in an arboretum labelled as Euonymus europaeus with corky wings as well - but it might have been a mislabelled E. alatus.]
Several varieties of elm have corky bark branchlets. The best one is Ulmus thomasii as you suggested. This one is not of that species. Others include Ulmus minor var suberosa, which this one most possibly is. There is also Ulmus alata and Ulmus x hollaandica 'Major' (The Dutch elm). Dutch elm is very corky, up to 2cm thick on branchlets. It is very common in southern engalnd and mature trees can be found around Edinburgh in Scotland. Ulmus minor var suberosa is still found as a tree, one that comes to mind stands near Dollis Brook, north London.
You must be a good guy to have 'around'.
Can you post some stuff about Elms in general and say a few things about how it is doing, generally.
Here we do have witch elm a'plenty - does that count?
Orkney (just outside Scotland)
Lat/Lng: 52.725, -1.1701
OS grid ref: SK561144
In woodland between kinchley lane and reservoir edge (against iron railings)