Yes but g4s put you through training if you don't have one. I have not long done mine through g4s.
If you are working a frontline job, as a security guard, retail security, cash transit, front of house or gereally dealing with the members of the public or working in a public environment, yes.
check the SIA website for clarification and its also down to what the employer whishes .
Answered - Relief Support Security Officer (Former Employee) - durham, sunderland , newcastle, middleborough,
Yes? The are different license you can gain with training.
Answered - Security Officer (Current Employee) - Altantic quay
Yes but the employ people without them and get staff to lie for them
Answered - Security Guard (Former Employee) - Derby
Yes, apparently g4s stopped doing training for sia. So they now only employ sia holders.