Had the same problem at the Hilton Wembley in August. No hot food in the Exec lounge during the week and the waitress just looked surprised when queried it! Looks like there's a lot of cost cutting going on at some of the hotels. Complete opposite at Hilton Heathrow T4 recently. They seem to change the hot food selection in the lounge each day. Had some very tasty and obviously very popular bbq ribs one night and they were replenished as the evening went on. Also noted drinks and food available 6 to 8.30pm in the lounge at that Hilton.