On 23 April 2018, Megabus, along with Stagecoach London, started operating three non-stop open top bus sight seeing routes in London under the Megasightseeing brand.
Each trip on the route is approximately two hours long, and uses a GPS activated pre-recorded 'guide'.
The three circular routes, which run hourly on the hour start from Tower of London, The London Eye, and Park Lane.
Tickets for the service must be pre-booked from the Megabus Website, and cash is not accepted at the roadside, however, bookings can be made for a particular journey right up to the time of departure, subject to availability.
Megasightseeing is the only non-stop sightseeing service in London.

Each sightseeing trip on the service carries up to 44 passengers.
By reducing the number of bookings per trip, a top deck seat can be guaranteed, something other sightseeing operators in London are unable to offer at the present time.

Megasightseeing follows the same yield pricing model of traditional Megabus routes, where fares can start from as little as £1 plus booking fee.

The buses initially used on the service are former East London and Selkent 2005/06 Alexander ALX400 bodied Dennis Tridents.
These vehicles have been completely refurbished and converted to open and part open top by Alexander Dennis.
They were housed at Bow bus garage.
To comply with the London low emission zone, all were replaced by Alexander Dennis Enviro400s in 2019.

For the first time since Megabus was founded, 'Sid' the Megabus mascot, has been given a voice - which can be heard in the automatic commentary on the vehicles whilst they are in motion on the tour.

On 9 June 2018, a Megasightseeing bus strayed in to a demonstration in Trafalgar Square in support of far right leader Tommy Robinson.
The bus was overtaken by protesters and a significant amount of damage occurred to the vehicle, resulting in it needing to be towed away.
On 23 April 2018, Megabus, along with Stagecoach London, started operating three non-stop open top bus sight seeing routes in London under the Megasightseeing brand. Each trip on the route is approximately two hours long, and uses a GPS activated pre-recorded 'guide'. The three circular routes, which run hourly on the hour start from Tower of London, The London Eye, and Park Lane. Tickets for the service must be pre-booked from the Megabus Website, and cash is not accepted at the roadside, however, bookings can be made for a particular journey right up to the time of departure, subject to availability. Megasightseeing is the only non-stop sightseeing service in London. 
Each sightseeing trip on the service carries up to 44 passengers. By reducing the number of bookings per trip, a top deck seat can be guaranteed, something other sightseeing operators in London are unable to offer at the present time. 
Megasightseeing follows the same yield pricing model of traditional Megabus routes, where fares can start from as little as £1 plus booking fee. 
The buses initially used on the service are former East London and Selkent 2005/06 Alexander ALX400 bodied Dennis Tridents. These vehicles have been completely refurbished and converted to open and part open top by Alexander Dennis. They were housed at Bow bus garage. To comply with the London low emission zone, all were replaced by Alexander Dennis Enviro400s in 2019.
For the first time since Megabus was founded, 'Sid' the Megabus mascot, has been given a voice - which can be heard in the automatic commentary on the vehicles whilst they are in motion on the tour.
On 9 June 2018, a Megasightseeing bus strayed in to a demonstration in Trafalgar Square in support of far right leader Tommy Robinson. The bus was overtaken by protesters and a significant amount of damage occurred to the vehicle, resulting in it needing to be towed away.
Megabus (Europe)