Hi Mike --My previous home( a cottage style property built 1889!) in London had a bathroom downstairs behind the kitchen ( beyond the airspace) . This was the only bathroom in the property. We had the bathroom re-positioned upstairs — took out a bedroom on the first first. Converted it to bathroom with W/C. Then added a separate W/C next door. Then we went into the loft and created 2 bedrooms upstairs. We should have put another bathroom upstairs but did not think of this at the time! It was well worth doing as it was a four bed house and did need an extra W/C. Previously a three bed house with bathroom downstairs.