As a stage actor, Sidaway appeared in several West End theatre productions and numerous provincial and international tours, including Number 10 and The Magistrate, both with Alastair Sim.
On screen, he performed in film and television, including two Doctor Who serials: as Avon in The Savages (1966) and Captain Jimmy Turner in The Invasion (1968).
Sidaway commenced his theatrical career in repertory at the Grand Theatre, Wolverhampton, in 1958, and at the Oxford Playhouse in 1959 before he studied at the London Academy of Music and Dramatic Art.
Sidaway subsequently moved into theatre production and produced and presented such productions as: Anastasia was written Marcelle Maurette and Guy Bolton, directed by Tony Craven and starred Nyree Dawn Porter, Peter Wyngarde, Elspeth March, David Nettheim, David Griffin and Ray Gatenby.
Sidaway's first film production work was for the Central Office of Information on documentaries and weekly news programmes.
In 1977 Sidaway co-created and co-produced the documentary series The Game Of The Century which consisted of six 30-minute programmes leading up to the 1978 FIFA World Cup in Argentina.
[4] Two further sports documentary series followed, The Game of The Century, World Cup ’82 (BBC) and A Choice of Champions (CBS), made for the 1984 Summer Olympics.
During 1992–1993 he worked at Twentieth Century Fox on The Day The Earth Caught Fire with co-producer with Ezra Swerdlow.
During 1994-95 Sidaway produced and co-wrote Rainbow, the family entertainment feature film starring Bob Hoskins, Dan Aykroyd, Jacob Tierney and Terry Finn.
From 2008 to 2010 acted as audio-visual producer and writer on over 60 short films examining climate change and green technologies.
In addition wrote and produced the first audio series of 14 shows, which were first broadcast on Fun Kids radio in the UK.
On 27 January 2015, Sidaway presented a screening and discussion on high frame rate film making to industry leaders in Beijing, China.
It stars Willow Shields, Wu Lei, Joe Chen, Maria Grazia Cucinotta, Archie Kao and Christy Chung.