A number of London councils have been criticised for planning to impose standard parking fines on Boxing Day.
Councils waive parking restrictions on public holidays but as 26 December falls on a Saturday this year some do not recognise it as a public holiday.
One of those councils, Westminster City Council, said it will offer free parking on Monday 28 December instead.
But campaigner Paul Pearson said thousands of motorists "will have Christmas tarnished by a £120 ticket".
Of all 32 London councils, 17 confirmed to BBC London that they would impose parking restrictions on 26 December.
These included Westminster City Council in central London, Kensington and Chelsea in west London and Kingston Council in south-west London.
'Lack of consistency'
Councils offering free parking on Boxing Day include Lewisham Council in south London, Islington Council in north London and Hillingdon Council in west London.
Mr Pearson, of campaign group Penalty Charge Notice, said the lack of consistency will confuse people visiting and shopping in the city on 26 December.
"Boxing Day is a public holiday - it shouldn't not be a public holiday because it happens to be a Saturday," he said.
"Westminster and Kensington and Chelsea libraries and leisure centres are all closed on Saturday 26 December because it's a public holiday but they are going to be ticketing motorists and charging for parking because they say it is not a public holiday."
Only 14 councils said they would not impose parking restrictions on 26 December. BBC London is still waiting to hear back from Greenwich council.