Destination in its own right
The phrase "destination in its own right" was used from 1994 until 2013 by the Highways Agency, to prohibit operators from providing any more than the most basic facilities.
The phrase means that service areas could only provide facilities that would be needed by passing traffic, and nothing that would cause people to head out of their way to visit it. Quite literally, it can't be somebody's destination. This meant no lavish hotels, large shopping centres or activity centres. The government feared that elaborate facilities would be overrun by visitors and wouldn't be able to properly cater for passing traffic.
The rule stemmed from an original concern from the Ministry of Transport. The early motorway services were built using land acquired with a Compulsory Purchase Order to provide a vital facility. If it turned out some of the land was being used to provide something that isn't vital, an aggrieved neighbour could argue that the CPO has been abused. When the government started selling the freehold of service areas, the rule had to be made official.
The second fear was that a developer might be able to get around planning legislation by pretending to be building a service area, and then changing it to a supermarket.
Although A-road services were never owned by the government, the 'destination in its own right' rule applied to them too.
In 2013 service areas were deregulated, and this was one of many rules to be removed.
While the rule was in place, service areas persistently argued that the rule stopped them providing profitable or popular facilities. Arguably most lodges were being marketed at people staying in the local area, so were acting as a destination in their own right.
One curious exception is Rheged Discovery Centre, which serves as both an official service area and "Cumbria's leading family day out".
In the early days of service areas, they were frequently in trouble for unauthorised facilities. Granada were accused of running their services "like resorts", while Corley had a crazy golf course, and Newport Pagnell was chastised for over-celebrating its 30th birthday.
People often ask why the major supermarket chains never took an interest in service stations. Although they have some similarities, the destination in its own right ruling would have caused the supermarkets to look very different.