ok so I work for an agency for most of my supply teaching ( a few days a month) now and again I work for the council as a supply teacher. last month I worked 3 1/2 days and have just received £19.36. Rang pay roll and they have looked back over previous wages for the year (council) they have deducted over !!£100!! .back in oct I changed the way I got paid from my agency work. I used to pay an umbrella company (key portfolio) an £8 margin fee then they took away deductions then I paid tax at a lower rate, since October I get paid on pay roll for agency work. the council lady has told me that I am on br for any council work I do as they received a p45 (or I did!)from key pay. how can they look back to april and take 20% of any earnings I have had from them!!? am confused