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Thank-you all for your contributions.
I attach a further image of what I have identified as Trichocera hiemalis from my collection. Note the short curved V7 not seen on the Limoniid and the position of the posterior cross-vein in relation to the discal cell - level with the outer end in Trichocera and just proximal to the inner end in the Limoniid. I can also confirm that under the microscope the Trichocera has ocelli, while the postulated Limoniid does not.
Any further discussion would be most welcome.