There is a bit more to this thread that I will expand upon later.
The immediate question refers to sink wastes and traps, a job I am trying to do just now and would appreciate an opinion please.
If I fit the waste and trap as it is intended, the trap ends up very low inside the sink unit. Even allowing for the fact I can shorten the bit of pipe above the trap, it still ends up lower than I want, which forces me to put the shelf a lot lower than I want, or forces me to cu