Re: Sounds like many sites will publish enough hints
"But it's a bit awkward explaining the 2 year gap in the CV"
Assuming this gap was over 4 years ago then you simple tell the HR person where you were and remind them that it is now a spent conviction and that the rehabilitation of offenders act means they are not permitted to take any account of this information (unless the job is in one of the specific areas where this doesn't apply)