This was found in the 2017 survey of three national surveys of GB adults conducted by YouGov which included a ‘boosted’ sample for the City of Bristol.
Gwelwyd hyn mewn arolwg yn 2017 o dri arolwg ymysg oedolion o Brydain a gynhaliwyd gan YouGov a oedd yn cynnwys ‘hwb’ i sampl dinas Bryste.