Thanks TRC, I noticed that and it's interesting to read about the varying pieces of kit being used, and more importantly not used. Clearly, varying experience and risk assessments have led to the differing opinions. Again, the type of belt/harness/restraint utilised would depend on the likelihood of a fall. Some types of harness/belt would not have the required safety conformities as those designed to be capable of arresting a fall.
For example;
SAR Twin Rope Lanyards
This lanyard is ideal for work positioning and work restraint and also passes the full standard EN354.
NOTE: These lanyards are not to be used for fall arrest.
Lanyards complying to EN354 must be used in conjunction with an energy absorber complying to EN355 for fall arrest and NOT to exceed 2m in length.
For what it's worth, I've always thought that 'in the event of', it should be possible to extract oneself with one arm incapacitated and 'blind'.