Doing my class 2 at the moment but have an SP30 on my license. I received a 1 month disqualification and an £85 fine but NO points and this was 3 years ago.
How likely is it to make finding a job hard?
Unusual. I wouldn’t worry too much. SP30 is common. Presumably the ban is marked on your licence. But maybe come off at 3 years? But, if asked, always declare it to an employer as you leave yourself wide open in the future if and when it comes to light.
All the best, Pete 
Thanks. Yes it is on my counterpart license. It stays on there for 4 years so I have another 5 months then it’s taken off.