I've been offered a job that requires SC level clearance. Most aspects are fine, but the requirement to provide current supervisor contact details is difficult as I was hoping to be able to let my current employer know once SC has come through and I have a formal offer in place, especially as I have been advised not to hand my notice in until this point. Reference checks have already been done through HMRC and character references requested. It's not a performance concern and previous employers would be happy to give me good feedback, but for various reasons I can't stay long-term at my current workplace once they know I have applied elsewhere.
If you've been through the process, do you know whether it is likely that current supervisors will be contacted/interviewed? If I have to have the conversation to notify them then I have to but it would put me in an unfortunate position.