Confidence: It's likely to be this, but I can't be certain.
Notes: The first thing to look at when diagnosing a Myosotis are the hairs on the calyx. The species are split about 50:50 between those with appressed hairs and those with patent, curved or often hooked hairs. M. secunda is one of the former and as one can see from the photos, this plant falls into the latter category. On flower size one would suggest M. arvensis (<5mm) but as has been said here before, flower size is not a particularly good discriminator, although it may be a good general indicator. Without a fruiting specimen or pulling the petals off it's difficult to be absolutely sure (IMHO) and one cant do the latter from a photo!