Domestic tourism expenditure is reported using data from the Great Britain Tourism Survey and Great Britain Day Visit Survey, official statistics relating to tourism.
Adroddir ar wariant twristiaeth ddomestig gan ddefnyddio data o Arolwg Twristiaeth Prydain Fawr ac Arolwg Ymweliad Undydd Prydain Fawr, ystadegau swyddogol sy’n ymwneud â thwristiaeth.