Ridiculous.
DD's school manages exceptional SATs results year after year (even since the changes) despite 80% EAL and over 70% FSM. She did the Y2 SATs last year without even knowing it.
None of the children or teachers seem overly stressed and they don't stop doing other kinds of teaching for months to concentrate on them.
I imagine it's the poor set of expected results that caused the boycott and the HT should examine why they are performing so badly - there are plenty of schools in less than leafy areas who get great results.
I feel sorry for those children who have been denied the chance to achieve what they have worked towards. This can easily translate into problems at secondary where they won't be given the help to get the A* they might achieve at GCSE because they have no SAT score and so a C will do just fine. She has done her pupils a huge disservice - I would be very, very unhappy if I was one of the parents.