The average high frequency rate of TVs that have been around for more than a year is 520Hz. At only 100 hertz, the 43UH668 has a fairly slow high frequency rate compared to most of the other TVs of this age and type.
There are a number of alternative 100Hz refresh rate televisions currently available that you might want to consider including the LG 49UH668 (£499) which has better reviews; or the Sony KD-55X8509 (£429.99), or the LG 55UH668 (£489.99) both of which are cheaper.
If this television high frequency rate is too slow for you then you might want to look at the Sony 55W809CBU (£449) (1,000Hz) which is also cheaper.
What does "high frequency rate" mean?