Whatever Prime Minister Theresa May's Conservatives promise in their manifesto before a June election, managing Britain's exit from the European Union will limit her opportunity to push wide-ranging radical domestic change.

Brexit is already diverting government attention from other, often pressing, issues — the number of laws coming into force has dived to a 20-year low — and parliament will be occupied for a long time with deciding the fate of EU legislation introduced during Britain's four-decade membership of the bloc.

May, who was appointed prime minister shortly after Britain voted last year to leave the EU, has framed the election on June 8 as an opportunity to bolster support for her Brexit plan, while saying it will help her put her own stamp on government.