I have been informed that this little bee is probably a mining bee of the genus Andrena.
There are approximately 65 different species of these in the UK alone and they are apparently difficult to ID down to this level, so I shall not even attempt to do so. However, if anyone is able to from my photos I would be grateful for the information.
They often dig a nest in lawns or paths, but don’t cause any problems for the lawn. They also have a very weak sting and are non-aggressive.
They are known as solitary bees as they do not live in a colony, although they may nest within close proximity to other solitary bees. They are considered to be more efficient pollinators than honey bees. There is more information about solitary bees here.