Hello!
My wife's a TA and with all the pay rise talk going round she wanted to know what it actually means for her, so I knocked this together teachertakehomepay.co.uk
You put in role/level and area and it shows what you take home after tax, NI and pension, before and after the 3.5%.
It's free and there's no sign up. I'm not a teacher so there's every chance I've got something wrong! If a number looks off let me know and I'll sort it.
Happy to add things too if there's something that would be useful.