It's a hireboat, Mike. Built to a template same as a squiillion other hireboats, and has passed safety standards / every BSS since it was built in 1997/8. Cant have been that dangerous.
Clearance was not failed to be noticed by my last BSS. The cooker was pulled forward slightly and a baton fitted to prevent it pushing too close against the back wall. There was no safety concern about side clearance at all. Your statement about side clearance has only appeared in one Hotpoint manual. Not in the Zanussi or Indeset ones I've read. So how can you imply it was a failing of all previous BSS examiners regarding side clearance if only one manufacturer - who didn't build my cooker - states the need for side clearance of high walls?
The single cavity cookers are a nightmare for space. You have to open the huge door and leave it open while grilling. I consider that dangerous for anyone including myself walking by. I use the grill almost daily, often twice a day. Accident waiting to happen IMHO. If my safety standards are higher than BSS ones, then I'll go with my instinct.
I don't understand your advice to fit a separate hob and oven. Why? I have already asked whether it's feasible to change my freestanding set up for built in. But why two separate units when there are so many single piece built in cookers? What is being gained from splitting the appliance, except for money in the pocket of the carpenters and fitters? Splitting the appliance sounds like over engineering a solution and creating more problems.