The slowest high frequency rate of TVs that have been available for a similar time to this television is 50Hz and the fastest is 600Hz. The 43LX341 has a quite slow high frequency rate (only 60 hertz) compared to most of the other medium display diagonal TVs that came out around the same time as this TV.
It may also be worth considering one of the alternative 60Hz refresh rate TVs currently available including cheaper TVs such as the Sharp LC-43CFE6131 (£299.99).
If you want a TV with a faster high frequency rate then you might want to look at the LG 43LH604 (£300) (100Hz) which is also cheaper.
What does "high frequency rate" mean?