I've included a small element of etiquette because quite frankly I'm fed up of being told to stand up for the Corps March at Messs dinners!
As extracted from the relevant Policy Directive:
19. The Regimental quick march for the Corps is known as "The Royal Signals March". This march is based on the traditional airs "Begone Dull Care" and "Newcastle", the current arrangement being that made by Captain C Pike, Director of Music and authorised in Supplement to the Minutes of the 90th Meeting of the Corps Committee.
20. The Regimental slow march entitled "The Royal Signals Slow March, Her Royal Highness The Princess Royal", was specially written for the Corps by Mr R R Ricketts, Musical Director of the Royal Signals Band from 1926 to 1939.
21. When a Corps march is played, officers and other ranks should remain still in whatever position they are at the time and should keep silent. When playing a march, the band should remain seated if already in that position.
However the fanfare for Billy Smarts Circus would most likely be more apt at times!