I used to be responsible for recruitement and didn't find it very hard to do all the checks. A very small booklet would suffice for landlords. If someone had very good forged documents I am sure the authorities would not find the landlord guilty if he/she could prove they had done all they could to check.
I don't think it would be necessary to have some huge campaign to check them out, just one or two cases brought to court and that would be enough of a warning to dodgy landlords.
This seems to me to be made out to be a much bigger issue than it actually is.
Kate Garroway-Care at home costs