Organisers said 500 vehicles were expected to converge on Whitehall after an aid package proposed by the Confederation of Passenger Transport was rejected by ministers last week.
The CPT was told no help was available beyond those schemes that capture the wider economy. In addition, coach operators in England are still not considered eligible for the Retail, Hospitality and Leisure Grant Fund (RHLGF).
The sector has already seen the high profile collapse of Shearings’ parent Specialist Leisure Group in May and caused David Urquhart Travel to fold its coach business.