What is this autumn blooming tree?

Ffoxglove

I spotted this in my local park in full bloom!
It looks like a cherry but I thought they bloomed in spring?
Any ideas!? 

B3

Cherry plum can bloom very early.

Silver surfer

Prunus...probably Prunus × subhirtella 'Autumnalis Rosea' 
Flowers on bare twigs in winter.
Flowering now.

https://www.google.com/search?q="Prunus+×+subhirtella+'Autumnalis+Rosea"&tbm=isch&ved=2ahUKEwjWvN622pPtAhWn8IUKHQONDu4Q2-cCegQIABAA&oq="Prunus+×+subhirtella+'Autumnalis+Rosea"&gs_lcp=CgNpbWcQDDIECCMQJzIECAAQHjoCCABQpytYhk5gy2VoAHAAeACAAcABiAHBA5IBAzEuMpgBAKABAaoBC2d3cy13aXotaW1nwAEB&sclient=img&ei=NRG5X5bOIqfhlwSDmrrwDg&bih=578&biw=1280&rlz=1C1CHBF_enGB785GB785

Dovefromabove

I agree with @Silver surfer ... Prunus x subhirtella autumnalis ‘Rosea’. 

A gorgeous tree that will burst into flower in mild spells from autumn to spring. We had one at my last workplace and it was a constant delight through dreary winters. I bought one for my parents and they loved it too. 

Allotment Boy

Yes there are winter flowering cherries in Regent's park London.  When I did the RHS course our tutor told us about a story in the London evening standard claiming they were another example of global warming.  He wrote to them to explain that they always flower in winter I don't think they published his letter though. 

Ffoxglove

Thanks for the responses. Think I might have to get one of these!