First of all, you should attend the preview performance of an upcoming show which is usually organised a couple of days before the official opening. The tickets for the early openings are considerable less costly and people who attend previews often buy these tickets before leaving the theatre.
Tickets for the show in the opening few days are usually less expensive as the organisers want the actors get accommodated and it also grows the audience with the passage of time.
You can get preview tickets on discounted prices from the ticket offices of the relevant theatre. It helps people in saving money by availing discounted offers.
You can also purchase discount tickets from the tkts booths which are situated in Canary Wharf DLR station and Leicester Square. These two booths work under the supervision of the Society of London Theatres.
If the West End Theatre is not far away from your location, then it is the best idea to purchase the tickets from the box office of the theatre. You will get the tickets of West End Theatre by paying the face value which is cheaper than buying tickets from agencies that also include service charges.
You can also avail the discount offers on tickets for groups for visiting West End Theatre. You can watch the show with your colleagues, friends, class fellows and family.