If it were my shout I would log the top 3 of every species, regardless of where they're caught, on a website which would give you the option to filter the results, i.e. whether the fish were caught on a commercial or natural water, then it would just be up to the individual (me and you) as to whether they class the catch as reasonable or not.
For example; if I only ever fished rivers for common carp then I would be looking to beat the record carp caught in 'natural' water, or not. Up to the individual of course.
If people were willing to be open about baits used and exact locations (extremely doubtful) then you could filter it down more, but we all know that'll never happen
Either way, unless I'm just missing something; the records should be put into a lovely new format on a nice website, god forbid maybe even a new app for your phone!