I am re-doing the kitchen in my coffee shop and have a problem with waste pipes. A coffee machine and wash hand basin run into 40mm waste pipe which runs along a wall for about 3.5m and then goes into what measures as 60mm waste pipe. There is also a double sink which has to be removed but the waste outlets go into this 60mm pipe. I need to replace the T joints and put in straight connections as there are base units going in here and simply capping at some point in the waste trap encroaches on the unit space. The problem I am having is that I can't find 60mm waste pipe or fittings anywhere. Any ideas?