LONDON (AP) — The British Chambers of Commerce is urging the U.K. government to put forward a clear timetable for Brexit, arguing that the break from the European Union should be delayed if a trade deal remains incomplete at the end of the two-year time frame for negotiations.

Tuesday's report says Britain should avoid "sudden disruption to our trading relations" with the EU and argues that both the break and the trade deal should be completed simultaneously. An "extension" of the negotiating period should take place if that proves impossible.

The organization also wants provisions for companies to hire EU workers once the U.K. leaves the 28-nation bloc.

Ex-Prime Minister John Major warned Monday the two-year goal to settle the terms for Britain's divorce from the EU is "very, very optimistic."