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This explains it
Is parking on the pavement illegal?
Unless you live in London, there is currently no explicit law that bans it, and different civil and criminal laws cover pavement parking in different parts of the country.
Depending on the width of the pavement, it can be considered rather antisocial behaviour. It can cause inconvenience or even danger to pedestrians, especially parents with pushchairs, the blind or wheelchair users, sometimes forcing them to move into the road to get past. The police can charge you with ‘unnecessary obstruction of the highway’ because this offence covers all parts of the street.
If you park in Greater London, then there is a specific rule in the Highway Code that states “You MUST NOT park partially or wholly on the pavement in London”. Any Highway Code rule that uses the terms MUST or MUST NOT is a law, rather than guidance.
The exception is where a traffic regulation order (TRO) has been established, which can set rules about parking times and restrictions, with clearly painted bays that straddle the road and pavement.
There are more plans on the way that will likely ban pavement parking outside of London in the future.
https://www.driving.co.uk/car-clinic/advice/illegal-park-on-pavement-uk/