WASHINGTON (Reuters) - A future U.S.-UK trade agreement must incorporate strong provisions on worker rights, environmental protection, and enforcement to ensure bipartisan support, U.S. House Ways and Means Committee Chairman Richard Neal said on Friday.Neal, a Massachusetts Democrat, said many important questions need to be resolved, and he expected to work closely with U.S. Trade Representative Robert Lighthizer in forging a new U.S.-UK trade deal after Britain's exit from the European Union..