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Thanks Chalkie, this part of the spectrum gives me a headache!
Could you do me a favour please and compare my photo with these 2 pictures:
It looks to me like a germander speedwell but the colour of a wood speedwell.
I typed a long comment and deleted it by mistake...
I've looked at the links, but still think it's Germander speedwell.
It looks a typical germander speedwell colour to me - wood speedwell is much paler, with perhaps the veins standing out a bit darker. (I think the germander speedwell on the link looks paler/brighter than average - maybe just the way the photo was taken).
I hate it when books say 'lilac' (Rose describes Wood Speedwell as lilac) - actual lilacs are so variable, and I don't know which variation of lilac they mean! But they all have a degree of pink in them, and I don't think these flowers have that at all.
Also, I think the stems look furry in some places, and hairless in others, which fits with the 2 lines of hairs (which doesn't fit Wood Speedwell), and the leaves don't have stalks (again, doesn't fit Wood Speedwell).
Can you find it again and check for the 2 lines of hairs? That seems to be a pretty clear-cut distinction - much easier than subtle colour variations (which might vary depending on how much shade the plants were growing in, perhaps). If not, at least you'll know next time!
Thanks for your assistance Chalkie, I will have another look next time I pass it, as you say I will know what to look for in future.
And I did think carefully about the colour - maybe not quite as pure a blue as I'd thought. (I also checked that the leaves didn't have stalks - previously I'd have just thought 'germander speedwell' without considering wood speedwell, so I've learnt something too. Funny thing is, I didn't actually look for the lines of hairs!)
I passed my plant again last night with a group, and we can confirm two distinct lines of hairs on the stalks. Thanks!
Lat/Lng: 53.4302, -6.3754
OS grid ref: SB094015