Across all the TVs of this type and age the high frequency rates range from 50Hz to 400Hz. At only 50 hertz, the 24W1433 has a quite slow high frequency rate compared to most of the other TVs that have been available for around the same time as this television.
We think you might also be interested in some of the alternative 50Hz refresh rate televisions currently available including because of its better review score, the Toshiba 22D1333B.
If you want a faster high frequency rate then you might want to consider the JVC LT-32C461 (£154.99) (60Hz), or the Cello C24EFF (£246.94) (60Hz).
What does "high frequency rate" mean?