Terry,
Sorry to be so late in responding - haven't logged in recently. You are right, English guidance documents are hard to come by - but the Scottish Technical Advisory Notes TAN 22 and TAN 28 will provide some very useful benchmarks. Also Stewart Kidd has published some material online following work that he undertook in Europe which again is very helphul.
I find with all of the above that an understanding of the Functional Requirements of the BDoc are, identifying why a particular requirement is called for, will help in finding alternative messures to address the risk in a different way. The use of people to perform tasks that elsewhere might be carried out mechanically (signage, door closers, hold open doors that open against the direction of travel, security devices, visual fire detectors etc) may be appropriate provided that a clear and robust management strategy is in place and reliable.
The key is - if you don't want builders marching in with 4x2 timber and 8x4 plasterboard then provide a management strategy that overcomes all of the risks within the building... or use the building for something else.
Hope this helps,
Paul