Update to last post. Received the call from the supervisor they said they would make within the hour (will done again VHS, communication has improved) and he assured me the flow problem with the shower was not the boiler but the 'old' shower and that would be sorted out when we had the property upgraded, but couldn't advise as to what to do in the meantime. So it looks like upgrading to a new boiler can cause unforeseen problems to us, the consumer. So why didn't VHS mention this or indicate replacing the boiler could lead to these problems, information is key to helping us make choices and prepare for potential problems. Please take note VHS! What to do now though?