I don't think there's a definite answer. Certainly try asking on the frequency you are currently using. Many ATCOs, AFISOs and A/G operators are pilots too, and will know their local area very well.
However, if the forecast wind was even close to your cross-wind limits, I would hope that you thought of this before you left and had already planned an alternate? Of course, the wind does sometimes do things which it isn't forecast to do.
London Information would certainly be able to get the information for you, but would quite likely have to look it up, whereas the local ATCOs, etc, are more likely to have local knowledge and know the answer without going to their books.
Not sure that the Instructors forum is the best forum for the question, though: it will get a wider audience in Private Flying, from both instructors and experienced pilots; or you could try posting in the ATC forum for the other point of view. No doubt the moderators will move this thread somewhere else if they think it's appropriate.
FFF
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