More than that... you can't follow it. BSAC rules on long-hose mandate against a hogarthian/DIR approach. I suspect that's just not enforced at 'recreational' levels (single tank), but when/if you start using doubles, it will be.
Clarification statement on Alternative Supply Training
Recreational Diving
"f. Under no circumstances whatsoever does the above infer BSAC accepts the introduction of techniques by individual divers that differ from those prescribed by the main training agencies. For example NDC is aware that Primary Take methods are being promoted by some BSAC divers and instructors within BSAC Clubs, this is unacceptable to BSAC. History informs us that this leads to unacceptable levels of incidents in training and diving. In the past 12 years, using the current training techniques, there were only three reported incidents where the out-of-gas buddy has deliberately snatched their buddys regulator from their buddys mouth.
Removing a buddys primary regulator in an out-of-gas stressed situation not only affects the out-of-gas diver but will also increase stress levels in the potential rescuer and this could significantly impair a successful resolution to the problem. In the BSAC incident reports we have evidence that fear, panic or extreme stress can cause divers to revert to instinctive learned initial training. Should primary take be accepted or encouraged, this could have severe consequences in an out- of-gas situation whereby there is an increased risk of two casualties. In addition, on expeditions and on holidays a diver may dive with a variety of buddies and in panic may remove another divers regulator (not necessarily their own buddy, but that of the nearest diver) and this could not only compromise a rescue but could have severe legal ramifications."
Technical Diving
"f. The BSAC Technical courses do not teach the Hogarthian Wrapping method. BSAC Technical does not mandate the use of manifolded twins with isolator. This configuration is required for the application of Hogarthian wrapping. A proportion of our members attend courses and dive with independent twin set configurations, some with buoyancy compensator devices (BCDs) which do not lend easily to the Hogarthian wrapping method as the diver periodically breathes between primary and secondary regulators and the short hose is not rigged for deployment to their buddy. Many divers prefer a left and right handed regulator method allowing the buddy to share gas from either cylinder. This represents a natural course of development for many of our members. Another consideration is that Hogarthian Wrapping requires all stage cylinders to be attached on the left hand side of the body, to allow for ease and consistency of deployment of the primary regulator. BSAC allows our members the flexibility to dive using the rich is right principle, a technique used by the majority of our closed circuit rebreather divers (i.e. 1 in 10 divers today) and many open circuit divers. BSAC Technical Courses are deliberately written for maximum consistency with the core BSAC Diver Training Programme, as potentially any technical diver may be paired with an Ocean, Sports, Dive Leader or Advanced Diver during branch or expedition dives. BSAC does recognise the value of the underlying philosophy of Hogarthian Style i.e having a streamlined kit configuration and carrying only equipment appropriate to the particular dive."
