Yes, you must complete a DBS check through Verisure prior to employment, which you must pay for and is deducted from your wages. You can not use a previous DBS certificate, no matter how recent.
Not long at all.
Employ anyone who is able to walk.
Yes it’s all done on the first day
Full dbs check required
Yes. Enhanced background check. About a week
Like 10 seconds
Crb and third party company running references
No, no background checks required