After some searching on the web, I found the National Barkfly Recording Scheme website. This is an excellent website, with on online key to all of the species, a gallery with excellent pictures and lots of good information about this group.
Using the information on the website, I have been able to identify my specimen as Trichadenotecnum sexpunctatum (easy for you to say!). One of the useful features are the large dots on the cells around the distal end of the wing.
This species is associated with tree trunks and the branches of a range of deciduous and coniferous trees and bushes. A look on the NBN website also suggests that this is the first record of this species for Shropshire, though I am sure that this says more about recording effort than genuine rarity.