Interesting Tits

Theres been an interesting looking tit in a back garden in Bucks recently (photo on birdguides). It looks like an Azure tit with a yellow wash to the breast. It looks like a Yellow breasted tit or a Pleske's tit (Azure/Blue hybrid). Both species are pretty sedentary and certainly not long distant migrants. In the last few years I have noticed Azure tits and Yellow brested tits for sale in cage and aviary bird magazine so I would think this bird is most likely of captive origin and not a true vagrant. Nevertheless it still looks like a nice bird to see. What do you guys think? Anyone going - Robin, Martin?