If you take off the panel at the front bottom as above, you can take the whole ribbed sump pipe out - it pulls out both ends with some very gentle tugging.
Many, many thanks for this - the not cleaning properly problem has been driving us mad for a few days - was a choice between a new dishwasher (ours is 8 years old) and a repair man.
Opened the machine up as described and the bottom hose was sludged up completely - I am surprised we had as...