Plant id please

[WobblyLondoner]

Does anyone know what this is? Pretty flowers but will I regret letting it take hold in a border?

It looks like prunella vulgaris to me. I've got it growing in a patch of wild flowers, so you could consider it a weed! It spreads but the flowers are pretty.

Thank you, that is the one. Also called self heal and woundwort I read. I shall keep for now but not let it get too entrenched!

bees like it as well

It does spread but the roots are shallow so it's very easy to pull out of it tries to take over.