Confidence: I'm as sure as I can be.
Notes: Bottom left of picture shows some leaves - but they're not stalked. Looks ok for Germander Speedwell to me (and blue colours often come out strangely in photos). If you can see the plants again, you could check the stems - Wood is hairy all round, Germander has just two lines of hairs - very distinctive. Can't see this in the photo though.