The solutions on here have been great! You'll need to have a detailed discussion with your installer though as they may well have a different preference for kit and a method they use. I find installers are happier fitting and configuring in a way they have before with kit they are familiar with - presume its a confidence thing and proven solution since they will have to support it? You may have find an installer who thinks along the same lines as you/solutions suggested here if you really want the install to be as suggested with the kit you like.

Does this mean that the guy / girl assembling the cooker in the factory has to be gas safe registered, asking for a friend.