Problem here is that when signing on, JSA means that you are actually fit to work,
If diagnosed while signing on, then the first couple of weeks yes some leeway should have been given, and even now if you have an hospital clinic appointment to attend, the Job Centre need to take this into account and adjust your signing on slot if necessary. You just need to contact them straight away, tell them it's an hospital appointment that clashes with your signing on slot...
How this is impacts on your ability to find employment is negligible, obviously there are some jobs that you won't be able to do, police officer, paramedic etc.. But these jobs tend not to be advertised via the job centre.
The job centre must allow you while you are there, access to your blood glucose meter and hypo kit, do a test and treat if necessary, there's nothing more they need to adjust.
I would advise that when applying for a job, not to mark down a disability, but do explain at interview that you weren't quite sure how to fill this in, as yes even though diabetes comes under the disability/discrimination Act, you don't see yourself disabled, all you need is to have access to your meter and hypo kit at all times, and the ability to test and treat if necessary....
But when it comes to job hunting, the mind boggles..
My brother in law was made redundant last September, first time he's not been in work since leaving school, during one of his signing on's, the women gave him a list of job's
Asking him why he hadn't applied for any of these...
My BIL said, well they all asking for experience and qualifications, that I don't have... I've worked as a slaughter men for over 20 years for the same company, I'm not a qualified or experienced, electrician, plumber, ground worker or etc etc!
She informed him, I let you off this time, but next time you still have to apply or you will lose your benefits!
But you could always do as my son is presently doing, working for a Job agency, yes only temporary work, but it's good for his CV, my daughter did the same and finally bagged herself a permanent job after about 6 months...