Treasures in the wood

My friend and I have found a new wood to explore and today we discovereda patch of these interesting blue flowers. I won't say they're lovely but the patch of them spread under a tree did stop us in our tracks. Anyone know what they are? Looking forward to finding more treasures in the wood.

I have since been able to identify the plant thanks to a brilliant website Here is the page for this particular plant www.botanicalkeys.co.uk/flora/content/species.asp?1092

So it's Ajuga reptans or bugle

For the record: 18C, sunny and warm