Well the outcome of the test is I can use a conserver! I will be using cylinders and a conserver to get to work, a concentrator in the office, and my home prescription will stay the same using a concentrator and liquid 02 as I do now.
Planned return date 10th Sept on a phased return (flexi hours) working downstairs I will still need to finish my PR that will end on 24th Sept so have asked for time off to attend. Think it should be ok with my employer whoo hoo who's going back to work x