  We present the results of seven years of multicolour photometric monitoring
of a sample of 31 $\gamma$-ray bright blazars using the RINGO3 polarimeter on
the Liverpool Telescope from 2013--2020. We explore the relationships between
simultaneous observations of flux in three optical wavebands along with Fermi
$\gamma$-ray data in order to explore the radiation mechanisms and particle
populations in blazar jets. We find significant correlations between optical
and $\gamma$-ray flux with no detectable time lag, suggesting leptonic emission
processes in the jets of these sources. Furthermore, we find the spectral
behaviour against optical and $\gamma$-ray flux for many sources is best fit
logarithmically. This is suggestive of a transition between
bluer-/redder-when-brighter into stable-when-brighter behaviour during high
activity states; a behaviour that might be missed in poorly sampled data,
resulting in apparent linear relationships.
