In the submitters opinion the best spotting hotel at LHR & one of the worlds best for proximity to an active runway, The hotels website allows you to book a runway view room from which all movements on the northern runway can be read off and photographed easily.
Movements around the terminals & on the Southern runway are easy to see & can be identified using a flight tracking app. Photography from the room is easy - if the windows are clean, obviously the higher the floor the better the view.
Although this hotel is not the cheapest at the quality of spotting makes up for it, I usually book a 3 night stay with breakfast, for other meals I use a nearby pub (Three Magpies) as the hotel bar & restaurant food is expensive & bland.
https://maps.app.goo.gl/avSikJCqWvVCvFbW6
