Gowers, himself an Englishman, said that  in Scotland, its land of origin, the pronunciation is skawn , and English people who know this so pronounce it. 
( Gowers ( , ( ( himself ( an Englishman ) ) ( , ( ( said ( ( ( ( ( ( ( that ( in Scotland ) ) , ) ( ( its land ) ( of origin ) ) ) ( , ( ( the pronunciation ) ( is skawn ) ) ) ) , ) and ) ( ( English people ) ( who ( know ( this ( so ( pronounce it ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NNS Gowers)) (, ,) (S (NP (PRP himself)) (NP (DT an) (NNP Englishman))) (, ,) (VP (VBD said) (NP (NP (NP (DT that)) (PP (IN in) (NP (NNP Scotland)))) (, ,) (NP (NP (PRP$ its) (NN land)) (PP (IN of) (NP (NN origin)))) (PRN (, ,) (S (NP (DT the) (NN pronunciation)) (VP (VBZ is) (ADJP (JJ skawn))))) (, ,) (CC and) (NP (NP (JJ English) (NNS people)) (SBAR (WHNP (WP who)) (S (VP (VBP know) (S (NP (DT this)) (RB so) (VP (VB pronounce) (NP (PRP it)))))))))) (. .)))
The original Scottish pronunciation is the easiest to say.
( ( The ( original ( Scottish pronunciation ) ) ) ( ( is ( the ( easiest ( to say ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ original) (JJ Scottish) (NN pronunciation)) (VP (VBZ is) (NP (DT the) (JJS easiest) (S (VP (TO to) (VP (VB say)))))) (. .)))