Omg I love them! Shrews in general are great (they're like snoot mice but ya know... not actual mice since they aren't actually rodents and are more closely related to like moles and hedgehogs).
Well if they're anything like water Shrews they'll just give you a really dirty look and refuse to get off your hand. I don't believe they're high risk to humans at all, but they do have (very tiny) sharp teeth and I wouldn't want a nip. Water shrews do have a toxic bite, but not harmful to humans.
That said they are pretty easily stressed and would prefer to be left alone, but should one cross your path and the opportunity to pet it arise, it wouldn't do you any harm AFAIK.
Addition: the water Shrew is the largest UK shrew at a whooping 4", and its bite while venomous is not powerful enough to puncture human skin. So i imagine the pygmy shrew is barely noticeable.