Monmouthshire in England or in Wales

Monmouthshire (historic) - Wikipedia, the free encyclopedia:
"'Wales and Monmouthshire'

The 1911 Encyclopædia Britannica unambiguously described the county as part of England, but notes that 'whenever an act [...] is intended to apply to [Wales] alone, then Wales is always coupled with Monmouthshire'. However, most Acts of Parliament included Monmouthshire as part of England, for example the Local Government Act 1933 listed both the administrative county of Monmouth and county borough of Newport as part of England, but in the rare event that an Act of Parliament was restricted to Wales, Monmouthshire was usually included as 'Wales and Monmouthshire'."