When are new TV's released?

[samu23]

HI All

My 5 year old LG has just given up the ghost so its time to look for a new one. I want to make sure I will be getting a newish model, not what that is about to be discontinued.

When do most of the big brands release their new models (Samsung, Sony, LG, Panasonic)?

Looking for a 48-55" TV which I would quite like to have 4k, doesn't seem to be too much available currently. Budget is up to £1k so I might be better off getting a decent 1080p unit?

Thanks,

Sam