Marriott Bonvoy is currently running several summer promotions in Europe. As part of this offer, you can get complimentary breakfast for 2 every day of your stay at several participating properties in Europe, including the UK. Be aware that limited numbers of rooms are available for this promotion. So you might not always get the offer on all hotels.
You have to use the following codes to avail the offer:
Standard Rate: Code C9E.
Members Rate: Code 6ME. Up to 5% off for members
The rate is fully prepaid. Non-refundable and non-amendable, if cancelled more than 1 day after booking. See terms on the offer page for details.