In the UK SARG has granted units authorisations to provide combined ADI and APS using an ATM on the basis of the local procedure passing through the unit SMS and then being subjected to SARG for approval. There usually are quite severe constraints on the level of traffic (in all its senses) that could present during the period that the procedure is in use. Ergo, units proposing to adopt these procedures need to convince the regulator that there is minimal possibility of unforeseen traffic overloading the ATCO.