According to an unnamed source cited by Reuters

The House of Lords yesterday approved an amendment to the EU withdrawal bill which will grant parliament more power regarding the final deal for Brexit.

But the bill will now go back to a vote at the House of Commons tomorrow as May looks to fight towards rejecting that amendment. It's a crucial next 24 hours for May and her government, as this will very much determine what kind of Brexit we will see coming.

Cable now down to session lows, with the euro also falling alongside it. GBP/USD is down to a low of 1.3175 on the day while EUR/USD trades at a low of 1.1533.