Aloud.com
Buy tickets online or sign up for the free gig alert service.
http://www.aloud.com/

Discount London
Enjoy entertainment, travel and leisure on the cheap in London.
http://www.discountlondon.co.uk/

Enjoy England Direct
Book restaurants, coach journeys, days out, attractions, tours, theme parks and many other things in England using the one stop reservation facility on this official tourism website.
http://www.enjoyenglanddirect.com/

Keith Prowse Ticketing
An interactive online box office.
http://www.firstcalltickets.com/

Last Minute.com
Concert, theatre, sports and restaurant booking at bargain prices.
http://www.lastminute.com/

London Discount Theatre
Theatre tickets and package deals.
http://www.london-discount-theatre.com/

London Net
Provides tickets and information for ballet and contemporary dance events.
http://www.londonnet.co.uk/ln/out/ent/dance.html

London Theatre Bookings.com
Book a seat at a West End show online.
http://www.londontheatrebookings.com/

London Theatre Box Office
Online box office.
http://www.londontheatreboxoffice.com/

London Theatre Direct.com
Specializes in discounted theatre tickets.
http://www.londontheatredirect.com/

Scarlet Mist
Avoid dealing with touts by using this ethical gig and festival ticket exchange site.
http://www.scarletmist.com/

Seatwave
Buy and sell second hand tickets to live events.
http://www.seatwave.com/

See
Online retailer of tickets for theatre shows, gigs, concerts, festivals, exhibitions, sporting events and more.
http://www.seetickets.com/

Stargreen
Sells tickets for shows and gigs taking place specifically in London.
http://www.stargreen.com/

Stop Tout.com
An ethical ticket exchange that sells tickets strictly at face value.
http://www.stoptout.com/

Ticketline
The UK’s leading independent ticket agency.
http://www.ticketline.co.uk/

Ticketmaster.co.uk
Ticketmaster sells tickets of every kind online, including theatre tickets. The website contains a useful London theatre guide.
http://www.ticketmaster.co.uk/

Viagogo
Buy and sell tickets at face value.
http://www.viagogo.com/
http://www.viagogo.co.uk/