I am using a call to a map like: {{#display_map:{{SUBJECTPAGENAME}}|zoom=10}} for my location type pages, however this produces a result from a search on maps.google.com. Ideally I would like the results that would be shown on maps.google.co.uk as most of my locations are in the UK, is it possible to change the behaviour so that this happens?
Not currently. You could place a feature request for the Maps extension on bugzilla, though do nto expect this to be added soon unless some dev is interested in doing so.