At the moment it is free to use the DSR OSC. However, obtaining and maintaining the DSR OSC has real costs, as does the training so there are two charges applicable currently. One is a £695 +vat for the training course, the other is an annual charge of £150 +vat in addition to your usual annual DSR Professional Membership fee.
We advertise for groups to join the DSR OSC every few months. We do need a minimum number to make the training course worthwhile so when the courses are actually run remains flexible.