I work in a factory environment which has a loud HVAC system and uses a range of equipment including ultrasonic devices. I have a high pain threshold, which is how I'm able to work in an environment that would be torture for many on the spectrum, but I find it tiring and sometimes the noise does surpass my tolerance levels.
I have found some ear plugs that I believe will help. They are about £25 - if I asked my employer to pay for them, do they have any legal obligation to provide them, or would it just be a goodwill gesture on their part?