Question: Are both Tim Lambesis and Joel Pott English musicians?

Context paragraphs:
Shadows Are Security: Shadows Are Security is the third album by American metalcore band As I Lay Dying.  The album was released on June 14, 2005 through Metal Blade Records, and was produced by Tim Lambesis, the band's vocalist, and Phil Sgrosso, one of the band's guitarists, along with Steve Russell.  A Limited Edition was released on June 23, 2005 with a bonus DVD of a show filmed at the Substage Club in Karlsruhe, Germany on November 28, 2004.  The CD was released again as a Special Edition on October 17, 2006 with a DVD on the making of the album and included videos of Confined, Through Struggle, and The Darkest Nights.  It also featured additional linear notes from vocalist Tim Lambesis on the concept of the record and little known facts on the making of the album.

Athlete (band): Athlete are an English indie rock band formed in Deptford, London, comprising Joel Pott (lead vocals and guitar), Carey Willetts (bass and backing vocals), Stephen Roberts (drums and backing vocals) and Tim Wanstall (keyboards and backing vocals).

As I Lay Dying (band): As I Lay Dying is an American metalcore band from San Diego, California.  Founded in 2000 by vocalist Tim Lambesis, the establishment of the band's first full lineup, which included drummer Jordan Mancino, occurred in 2001.  As I Lay Dying has released six albums, one split album, and two compilation albums.

Arise and Conquer: Arise & Conquer is the third full-length album by Christian metal band War of Ages.  The album was released on July 22, 2008 by Facedown Records.  The album was produced by Tim Lambesis of As I Lay Dying.  The band has released a one-minute clip of "Sleep of Prisoners" on their MySpace, as well as the song "Through the Flames".

Don't Matter Now: "Don't Matter Now" is a song by English singer-songwriter George Ezra.  The song was written by Joel Pott and George Ezra, with production handled by Charles Hicks, Cam Blackwood and Joel Davies.  It was released to digital retailers on 16 June 2017, as the lead single from Ezra's upcoming second studio album.

John Pott (British Army officer): Major Robert Laslett John Pott MBE MC (14 July 1919 – 23 April 2005) was a British Army officer who, during World War II, served as Commanding Officer of A Company, 156th Battalion, Parachute Regiment, in the Battle of Arnhem, part of Operation Market Garden, in September 1944.  Sixty-five years after the Battle of Arnhem, John Pott's story became more widely known because of a song written about him by his grandson, Joel Pott, lead singer of the Ivor Novello Award winning indie rock band Athlete.

Total Brutal: Total Brutal is the debut full-length album by Austrian Death Machine, a project of As I Lay Dying's vocalist Tim Lambesis.  The band and record are based upon Arnold Schwarzenegger and his movies.  Tim plays all of the instruments (apart from guest solo guitar work) and performs vocals but "Ahhhnold" is billed as the vocalist.  Destroy the Runner vocalist Chad Ackerman voices all of the Schwarzenegger impersonations.  The album was released on July 22, 2008.  On the cover of the original release of the album "Machine" was spelled with two 'i's, while new pressings of the album have the spelling corrected.

Joel Pott: Joel Laslett Pott (born 20 January 1979 in Spilsby, Lincolnshire) is an English musician.  He is the lead vocalist and guitarist of the indie band Athlete and an award-winning songwriter.

Tim Lambesis: Timothy Peter "Tim" Lambesis (born November 21, 1980) is an American extreme metal musician, producer, and convicted felon, best known as the founding member and lead vocalist of American metalcore band As I Lay Dying.  He also had a solo/side thrash metal project in tribute to actor Arnold Schwarzenegger, Austrian Death Machine, in which he performed all the instruments.  He also formed a death metal band called Pyrithion and played guitar for Society's Finest and Point of Recognition.

Double Brutal: Double Brutal is the second full-length album by As I Lay Dying vocalist Tim Lambesis' parody project Austrian Death Machine.  Unlike the previous album, "Total Brutal", "Double Brutal" is a two disc effort; the first disc composed of original songs inspired by Arnold Schwarzenegger movies, and the second disc being covers of songs that can relate to Schwarzenegger movies.  Upon release, the album debuted at No. 105 on the "Billboard" 200.

Supporting paragraphs: Tim Lambesis Joel Pott
Answer: no