"I've just had to give my son his large Logik TV". So what was he watching then if you had it?
J/K, I know what you meant to say.
Logik are one of those "exclusive to Currys" brands. It'll be a rebranded something else, much like Alba and Bush are the exclusive to Argos brands. According to ukwhitegoods.co.uk a lot of the white goods that were Logik were most likely rebranded Vestel so it would have been cheap and cheerful in the first place.
TVs have dropped in price recently and are almost always on offer somewhere. Can get a 55" one now at ao.com for £370 and there are some top brands on the likes of Amazon for around the same price point; all depends on how many HDMI ports you need and what Smart functionality you're going to use if any.