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It's just an old one pipe system (with an alteration to two pipe in places it seems). As @ShaunCorbs said, any Plumber with experience in commercial heating should be able to fettle your problems. They don't look much from here to be honest. Not a bad job!
I would also agree with @Knappers advice on using a good firm who appreciate the work that needs doing and want to do it properly. I would keep your ideas about spending a lot of money quiet for now and find the right Engineer with eyes/hands on advice.
The plant room pipe work leaves a lot to be desired and a pair of Vaillant boilers and a plate heat exchanger would look good eventually.
I would also agree with @Knappers advice on using a good firm who appreciate the work that needs doing and want to do it properly. I would keep your ideas about spending a lot of money quiet for now and find the right Engineer with eyes/hands on advice.
The plant room pipe work leaves a lot to be desired and a pair of Vaillant boilers and a plate heat exchanger would look good eventually.