Is it legal for a company to dismiss an employee who has a sick note for an injury they received while working for the company?
I work as a labourer for brickies on site and I'm cards in with the company. One day a few weeks ago there was a shortage and I ended up labouring on at least 6 brickies. I had to grab bricks, mortar and blocks for all of them and I only had two loading bays to get the materials from and the brickes were all spread out. It was extremely excessive work for one person to do and I was just expected to do it anyway eventhough it was at least 25° outside too. Ever since this I've had pain in both of my arms, especially whenever I have to do straight arm lifts. I didn't think much of it up until yesterday when I finally said something to someone who told me they have had a similar thing when they used to play squash in the past and it looked like tennis elbow. I got sent home from work yesterday and was asked for a doctors note. I'm getting one tomorrow but it's for four weeks and I'm worried that they'll probably dismiss me because as anyone who's worked on site knows, labourers are extremely expendable. The fact that the managers didn't really care about my injuries either and just told me to "carry on" and "ill be okay." And they had to be nudged to send me home as well just tells me that they couldn't care less about my wellbeing as long as I still worked for them. Is it legal for them to just dismiss me when I have a sick note and the fact that I got the injury whilst working there?
Edit: I'm in England
20th October 2021