Scotland's Finance Secretary Shona Robison said the visits imposed "substantial operational and financial burdens on Scottish public services, particularly Police Scotland".
The chancellor is understood to be considering cutting the 5% VAT rate on bills to zero, a move that would save billpayers around £80 a year and cost £2.5bn to implement.
Fiona Goddard and Ellie Reynolds, two prominent survivors, resigned from the panel over the last 48 hours, expressing concerns about how the process was being handled. A third followed this afternoon.