Not comparable between England and Scotland due to question and category differences.
Percentage of households containing a concealed household
English Housing Survey
Ministry of Housing, Communities and Local Government
2012 Apr to 2013 Mar - 2018 Apr to 2019 Mar
2012 Apr to 2013 Mar
EHS maintains the comparable time series on concealed households and sofa surfing in England.
Percentage of households with at least one concealed family
Scottish Household Survey
2013 to 2015
One-off analysis at present
Data from multiple survey waves are pooled to provide a robust sample for analysis. However, some local authority estimates are unavailable when the sample size is sufficiently small.