I think this is probably a Tree Bumblebee (Bombus hypnorum)- quite small, and had some white markings on it's face, suggesting this is a male. Only the second time I have seen one in garden in Preston.
Copyright: Paul Iddon - A View of the UK
Camera: Canon EOS 70D
Lens: EF100mm f/2.8L Macro IS USM
Exposure: Auto exposure, Aperture-priority AE, 1/80 sec, f/9, ISO 100