The Shadowserver Foundation have produced a set of statistics that detail the number of infections of the Conficker infections per ASN. The statistics for JANET (ASN 786) look promising. Bearing in mind that the large increase in infections coincides with the start of the academic year, and that numbers will start to naturally decrease towards the holiday period, the overall trend still appears to be downward. The numbers are very favorable compared to similarly sized commercial providers.
JANET CSIRT have more information on Conficker, how to detect and investigation infections and protect your network.
