I expect it can be pronounced the same as the cake 'You Tunnock cake!' 'What a complete Tunnock!'
(
maiden is filmed before a live studio audience,
Fri 2 Dec 2011, 12:28,
archived)
Yup - tunnock's cakes are favourites of ours :-D
taters Bah weep grahnah weep ninibong,
Fri 2 Dec 2011, 12:33,
archived)