Typically TV's can't do anymore than display pictures on them. I haven't seen one that can play movies off a flash drive yet.
I bought a new TV in the last month and when we were looking found that most played pics and videos from USB. Even the cheapy supermarket own brands.
To the OP, SD cards are dirt cheap now, and so are readers so you will be able to pick one up for under £15, or even £6!!! Don't know if adapters exist tbh.
Hope that helps, Doug.