Lets hope this is NOT a repeat of last year when many UK Airports failed to uphold their responsibilities during winter operations.
ATC not prepared to give a braking action is threading on thin ice to say the least, Expecting the flight crew to make an assessment (from the flightdeck???)...This is just not acceptable,
And flight crews need to exercise some judgement too, perhaps? If enough info not available, divert?
Have you any idea how difficult it is for even the most experienced experts to make accurate assessments of Braking Action on contaminated runways?