The Ilford web site and the ID11 package info. is 14 minutes at 20c for the above film/dev combination but an Ilford wall chart I have says 11.5 minutes. I guess the web site is the best info. BUT I had assumed the wall chart was right so I used it without checking the other sources of information. I found that 11.5 minutes gave thin negatives so reduced film speed to 200 ISO and it seemed to work OK. So I'm a bit confused. Should I be pragmatic and rely on experimentation or can anyone advise whether I should increase film speed and increase development time ( 400 ISO and 14 minutes) or should I go to basics and try several different film speeds with different development times? Any advice gratefully received. Thanks Jeff PS I print on Ilford multigrade in MG dev.using a meopta colourhead.