The Samsung J5500 in a 48in is available for £419 currently, with 3 HDMI's, optical out, and smart. I watched one for a couple of days the other week, and I was surprised at how good it still was, when set up properly.
Its worth having a look at clearance items (so you can buy a better spec for your money), Black Friday, etc. However, I think the Samsung is a benchmark, and certainly going to be a better spec than the Techwood for not that much more money.