When best to prune maple tree?

I have a large maple tree about 25 yrs old picture 1. It’s had a fair few prunes - good and bad and keen to get in control. When is the best time to prune? Please can anyone advise. Also I have a large cherry blossom picture 2 which is same but reading everyone suggests after flowering. Assume that’s correct too. If so Bullfinches will be happy! 
Thanks in advance.


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The exception is members of the prunus family, including ornamental cherries, which should be pruned in late March or after flowering finishes. Doing those in winter can lead to silver leaf disease which is best avoided.
Have a read of this info for how to go about pruning your maple -
https://www.rhs.org.uk/advice/profile?pid=233