Time-keeping and discipline is a red herring. Performance on the job is the bigger issue. There is zero sanction for a teacher who delivers poor performance in the classroom. Delgany throws out some managerial waffle but the truth is schools are powerless to take on an under-performing individual and it's the pupils who suffer. As someone said earlier the public sector approach of en bloc pay awards means there is no real means of rewarding consistent good performance. It must be very demoralising for good people to sit in the staff room and know that some tool who does little work gets the same pay as someone who works hard.
In a school or over 200 staff, you will get the useless ones for sure, in your own place of work you'll have ones that do just enough to not lose their job, be in in the manufacturing side of things or up in management. That unfortunately is a fact of life. The problem I see here is those that have are hammering teachers are using a big brush to taint them all as useless hoors, hitting the Public sector as well.
I'd say the percentage is very low with regards to very underperforming teachers, the stories I hear of parents coming in and asking for their kids to be doing higher math when their kids struggled to get a C in GCSE is very common and shows you how deluded some parents are..
If you are not happy with a teachers performance make a report, send it to the principle and board of Governors, the role of a governor can be described as monitoring and evaluating the progress of the school. This involves being curious, critical, and confident in asking difficult questions.. They meet every so often and they would have to react to these letters that keep turning up..