The slowest high frequency rate of televisions of this age and type is 50Hz and the fastest is 400Hz. The 28 GHW 5600 has a quite fast high frequency rate (200 hertz) compared to most of the other similar spec televisions that were launched around the same time as this TV.
There are a number of other 200Hz refresh rate televisions currently available that you might want to consider including because of its better review score, the Panasonic TX-32C300 (£209).
If you would prefer a TV with a faster high frequency rate then you might want to consider the Sony 32WD752SU (£349) (400Hz).
What does "high frequency rate" mean?