Downton Abbey has set a world record for its critical reception, according to Guinness World Records.

The ITV1 period drama scored the highest critical ratings for a TV show, snatching the title from Mad Men, Sons of Anarchy and Modern Family, who shared the record in 2009.

Downton Abbey averaged a Metacritic score of 92 out of 100, compared with 86 out of 100 achieved by the three previous record-setting shows. Metacritic.com aggregates opinions from leading international reviewers.

In terms of viewership, US medical drama House is listed as the most popular programme currently on TV, at its peak being watched by 81.8 million people in 66 countries, edging out CSI: Miami with its viewership of 73.8 million.

Another Great British institution to establish a new world record is Coronation Street, with Philip Lowrie recognised for the longest gap between TV appearances (same role).

Philip first appeared as Dennis Tanner in Coronation Street’s debut in 1960 and remained part of the cast until 1968; in May 2011, after a gap of 43 years, he returned to Weatherfield to take up his role as Dennis Tanner.

Commenting on his Guinness World Records title, Philip said: “I’ve always been proud to have been a member of the original cast of Coronation Street and now I’m doubly proud to be honoured with an entry in the Guinness World Records book for returning to play a part that I’ve always loved.”

The Royal Wedding of the Duke and Duchess of Cambridge also established a new title for the most live streams for a single event. The Royal Channel – the official YouTube Channel for the British Monarchy run by Clarence House – ensured that 72 million people worldwide watched the Royal Wedding live online, even more online views than Barak Obama’s inauguration.

The 2012 edition of Guinness World records is published on Friday.