You could self fund a basic DBS and see what comes up because that's what an airline and airport security will see when you apply for an airside pass. That will happen after you've been given a job offer which is unlikely if you are honest at interview because the conversation will be something like 'the chances of you getting an airside pass are small to nil so we won't be offering you a job'. Obviously if you are not honest at interview and get offered a job, when the DBS comes back it will probably be a very short conversation along the lines of 'Dear Mr rj, you lied about your past, wasted our time and money, please return any company material we have already sent you'.