The Triban 520 will clear 32mm with aplomb, however, the clearance is very tight for riding off the beaten path, I would advise against this, especially since the knob will stick out a bit further than a slick 33mm tyres.
Maybe this Clement in 32mm might be a bit better as it's slightly lower profile, and a good combination for on and off road (with a tweak in tyres pressure)
Alternately the smaller Schwalbe CX Comp in 30mm is also a good shout and have enough knob but decent on the road, can be found for a tenner if you look around;
The Triban 520 will clear 32mm with aplomb, however, the clearance is very tight for riding off the beaten path, I would advise against this, especially since the knob will stick out a bit further than a slick 33mm tyres.
Maybe this Clement in 32mm might be a bit better as it's slightly lower profile, and a good combination for on and off road (with a tweak in tyres pressure)
https://www.planetx.co.uk/i/q/TYCLMSOXP/clement-xplor-mso-tyre
£21 too.
Alternately the smaller Schwalbe CX Comp in 30mm is also a good shout and have enough knob but decent on the road, can be found for a tenner if you look around;