Originally Posted by jethrobee

I think your best bet would be to head to T5 and drop your bags in for the next flight, or try and check them through if you dont have anything in them that you will need.

As far as I recall there is a left luggage in T5, it is operated by the excess baggage company which is on the arrivals level at the end where the domestic arrivals come in - just past the M&S.

Hope that helps!