My salary certainly hasn't increased by 19% in any terms in the last 10 years! They have increased by around 10% in financial terms but decreased in real terms with increased costs. As for the retirement (pension) scheme it is funded partly by contributions from teachers and partly by the employer's contribution in much the same way as many other pension schemes.
Yes there are a lot of people worse off. But there are many who get higher salaries for less work. I didn't want to strike - it will mean that next month I will be struggling to make ends meet at all - but a majority decision was made and it was time that it was made clear that teachers were not going to just continue to have their workload increased with no financial reward.