As stated, de-icing at MAN is done by either Airline Services or Swissport (ex Servisair). At the start of the summer I saw an Easyjet de-icing rig knocking around but not sure what happened to that, or who's it was?
De-icing fluid is liquid gold and a massive money maker, on the grand scheme of things MAN is usually pretty decent when it comes to de-icing. I often hear complaints of much bigger de-icing queues at larger airports who more frequently get snow.
As for snow clearance, again, I don't think we're worse than any other UK airport. Few years ago MAN invested in a lot of shiny new snow clearance equipment, I've yet to see it being used properly as it hasn't snowed.