The pale blue three-wheeled 'invalid carriage' or 'Invacar' was a familiar sight on Britain's roads in the 1960s and 1970s. The cars were supplied free of charge to motorists with disabilities in their tens of thousands. Following news that the scheme was to be phased out and replaced with a mobility allowance, Helen Piddock talked to Invacar users who feared a return to the old house-bound days.