The Hard Rock Casinos (Manchester and London) sent over some coupons for free drinks for up to 6 people. It was pretty much the only mail I would get at my apartment in Reading. Never thought much about it since my mailbox back home is FILLED with "offers" from the AC casinos (90% of which are not useful for me).

Hard Rock is also managed by Grosvernors. But come to think of it, it was pretty uncommon based on how I they normally operate.