I have been so far mentioning road work signs, but there are other things that can block pavement and as such I would think in this law which I know for a fact includes Vehicles because I have informed the police about these blocking the pavement and they have acted on it. So just because some inconsiderate Drivers think its ok to park on pavement because that is still legal but as you have read above it is illegal to block a pavement.
I don`t know what the penalty is for blocking a pavement to people legal entitled to access said pavement.
I would think other items such as household and shop refuse bins being left all over the pavement by the Council Workers. There are probably other things that block the pavements which will also be illegal depending on who is trying to use the pavement and the size off space they require to access the pavement.
Robert A Hunter