Orthography
Spellings are almost identical to other dialects of British English. Minor differences occur with words descended from Welsh which aren't Anglicised as in many other dialects of English, e.g. in Wales the valley is always "cwm", not the Anglicised version "coombe". As with other dialects of British English, -ise endings are preferred, i.e. "realise" instead of "realize". However, both forms are acceptable. For words ending in 'yse' or 'yze', the 'yse' endings are compulsory, as with other dialects of British English, i.e. "analyse", not "analyze".
Read more about this topic: Welsh English