Which is the busiest or biggest service area?
The biggest motorway service area in the UK (or Ireland) is Cobham on the M25. It stretches across two floors and only opened in 2012, filling a large gap on a very busy section of motorway. Its 36-pump petrol station is one of the biggest in Britain.
As motorway services are private businesses, they do not release details of how busy they are. A rudimentary analysis of social media suggests Cobham is talked about the most. This would tally with our own website analytics, which show that Cobham is searched for the most. We already know it's the biggest, so it's a logical conclusion that it would be the busiest as well.
See also: Smallest