Is it true that what number is national geographic channel on sky based on the following text?

National Geographic Channel HD is available in the UK and Ireland. It launched on 22 May 2006 on Sky channel 543. The channel joined Virgin Media's cable TV line-up on 30 July 2009. On 5 August 2009, it was also made available on UPC Ireland's cable TV service. The HD version available in the UK and Ireland was not originally a simulcast of the standard definition version of the National Geographic Channel, with some of the content coming from Rush HD, however from 1 December 2010 National Geographic Channel HD became a simulcast.
yes