As can be seen this Azalea is an early May flowering variety!
It is on chalky soil although it has had ericaceous soil added and is fed throughout the year with ericaceous feed.
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I may sound odd but just because we have a mild winter but last two coldest on record.You have to have temperatures for every day for a certain amount of years these are added by month then divided by year or years and we end up with a mean temperature for that period of time. So basically it takes a lot more to work out climate change than a plant flowering early.
Lat/Lng: 50.8, -0.3
OS grid ref: TQ2106