49" is IPS, avoid.
The 50PUS7000/12 can be different numbers too, so 50PUS7xxx/12.
The Samsung 50RU7400 is VA I think, someone else should chime in hear.
That was £399 in a lot of places over Black Friday, and a good set.
I presume that the 7450 is probably the same screen, different market.
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Mate bought that from them for £399 on Friday, not got it yet, so can't comment on it, but when I saw it in the store it seemed a great set at far more than that.