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I was going to reply to this before but decided to wait to see what others thought.

The British species was originally described as Elachiptera uniseta by Collin, which was compared with bimaculata. The main distinguishing character of Collin's species was the single pair of orbital bristles.

I have a couple of specimens that I had identified as uniseta using Collin's key to the British species of Elachiptera. However, one of these had 2 pairs of orbital bristles but otherwise looked identical.

I've now tried to identify these using Duda's Palaearctic key and the more recent one to the species of the European part of the USSR. Neither really gave a satisfactory answer. Apart from the difference in the number of orbital bristles between my 2 specimens, they have a different number of tubercles on the scutellar margin. The mesonotum doesn't appear to agree with that of austriaca (=uniseta) in the Russian key but the colour of the thoracic pleurae, used by Duda as a distinguishing character, suggests that species rather than bimaculata.

Comparing my specimens to those on this forum, they agree more with this one rather than this one.

I can't see much detail in your photos but the pleurae are largely pale, quite unlike those of mine and the dark patches on the mesonotum look slightly different. So I wouldn't entirely rule out the possibility of your specimen being bimaculata. It really needs to be checked by an expert.