Just in case you have … here are some recordings of Hawkins pieces on Youtube
First string quartet (1976) played by James Toll, Guy Button (violins), John Crockatt (viola) and Jonathan Rees (‘cello) in 2019
https://www.youtube.com/watch?v=ZbwaslLhZl8
‘Urizen’ played by Paul Silverthorne (viola) and Aglaia Tarantino (piano) at LSO St Luke’s in 2012
https://www.youtube.com/watch?v=t-NfGIbhXqs
‘Fuzon’ played by the Piatti Quartet live at ‘Rencontres Musicales ProQuartet en Seine-et-Marne’ in 2014.
https://www.youtube.com/watch?v=jFElZOSC6oU
All wonderful performances!