Well, the TAF is provided by the Met Office & funnily enough, doesn’t really seem to be any more accurate than the BBC/Met Office forecast.
TAFs are really very accurate, within their limited scope.
More about knowing you won’t be unable to land at the end of a long flight (cloud base, vis, crosswind) than forecasting the weather in terms of ‘will it be sunny?’ A very reliable but technical product.
That said free apps that give you worldwide TAFs are great!