OK Messy,
I've registered now - happy?
The question still remains - to tie or not to tie? I have retired from the service and now work in the middle east as a training officer. I've delivered BA training to our firemen based on the UK standard (TB1/97, etc) and in all my years in the seervice never connected to my BA partner. I also worked in more than one brigade, neither of which had anything written by way of policy on this matter and many others (searching and room clearance for example).
I've since had consultants who have been paid an awful lot of money criticise my company for not training BA wearers to connect with personal lines at all times. These people are ex-senior officers now carrying out consultancy work. I have also heard that connecting with personal lines is common practice in at least one of the midlands brigades - don't ask which because I don't know.
I personally favour remaining uncoupled and unfettered and will continue to train in this manner, with all efforts being devoted to developing competent wearers who are fully aware of the risks and are flexible enough to react to differing situations. Having said that, I am open to suggestions. If you know better then say so and why.