Had this tree for years in a pot, was bought to us and it has been moved from house to house and pot to pot, dog had most of it last year! Finally got a garden (see introduction) and it now has a nice place in the sun, it has never flowered like thios before, flowers were usually dark red but now seem pink!
I would agree it's an Azalea ... obviously like its new home. They like peaty soil and warm moist conditions and do well in the shade. They do not like strong sun .., ie, I cannot have them in the sun here.