The Bill would give the assembly greater powers

Liberal Democrats and Conservatives in the House of Lords succeeded in altering parts of the Government of Wales Bill during a debate on Tuesday.

The Bill will see the biggest transfer of power to Wales since the assembly was set up in 1999.

Ministers said the changes will be reversed by the Commons.

But they added that if the Bill is delayed further, it may not become law before parliament's summer break.

Opposition peers have inflicted several defeats on Labour during the passage of the Bill.

They have already reversed a proposed ban stopping candidates standing in seats and on regional lists during assembly elections.

On Tuesday, the peers succeeded in making further changes in areas such as the make-up and names of committees.

The UK Government said it would overturn the Lords' alterations when the bill returns to the commons in a fortnight.

But if there is further delay in the Lords, ministers have warned the bill might not become law before parliament breaks for the summer.