Campaigners have crowfunded in readiness for this legal challenge which has now begun.
The crowdfunding page at crowdfunder.co.uk/island-parking-tax-fighting-fund will give all pledges made by July 29 at 1.12pm to the appeal.
The petition calls on parliament to island proof transport infrastructure by banning councils from charging people to park at island lifeline ferry ports such as Fionnphort.
Representatives from six Mull and Iona communities tried to halt a mainland meeting scheduled for yesterday where Oban, Lorn and the Isles Area Committee were due to make a controversial decision on off-street parking charges for Mull.
Councillors consider ending free parking on Mull.
A proposal to cap controversial charges at a car park well used by hillwalkers was debated by councillors.