Hotel for family of 5

Where in England are you looking for recommendations?

Some smaller hotels will have Family rooms, usually in an annex, but these are somewhat rare, most rooms just are not very large. In most places you may need to look at getting a double and a triple (which may just be a double with a cot).

Another option is to look at hostels, they sometimes have rooms that are shared by 6 people or so, you can get the room for 5, pretty basic accommodation, bunk beds, maybe a bathroom down the hall. However some are more like hotels, a bit nicer.

When we did this in London (albeit 12 years ago), we booked two rooms at the Tudor Court Inn, near Paddington Station. Breakfast was included. Our 3 kids stayed in one room and we stayed in another.

hey hey CanadianSue
when is this trip planned, how old are your teens, what is your budget in pounds, how many days?
as mentioned you may have to rent 2 rooms, may have capacity of only 4 for safety issues, could be a hotel "ordinance" or city "ordinance" or both, like many other hotels around the world. look at the bed configuration, kids willing to sleep in a double bed or on a sofa couch/bed in living room? everyone wants to save money, how far out are you willing to go and then add the cost of transportation for all 5 to "main area". is it worth staying out of area plus time to get to attractions.
looking at apartments may be worth your while, kitchens, washer/dryer, more space to move around, some privacy, is 1 bathroom okay for all, read cancellation policies, left luggage or early check in, how many keys, location/location.
an important issue is check in time is usually 2p-4p, if later a late fee charge, check out time usually 10a-11a. look at times of flights coming and going, i've seen many people having to wait hours to get in or have late flight and more waiting which shows the stress/anger/crankiness with waiting at an airport. you can rent the room a night before or night after and tell the host/landlord/hotel what your plans are, just an option to think about.
booking.com
put your filters in
cross-pollinate.com
choose london, apartments and what is offered
tripadvisor.com
vacation rentals and your filters
look up serviced apartments, airbnb.com, vrbo.com look at total with taxes and fees
any other plans after london. it's a big crazy fun city, crowded, many atrractions spread out, many different restaurants/ pubs/shops,
what do kids like, make them do research and let them plan one day for all on their own
wowcher.co.uk
register with email, click london, click more+ (things to do, afternoon tea: some are 2 for 1
i'll gather a few other fun/interesting things to do/see and send you & your gang to check out.
aloha