Many thanks Gordon. A quick update - I spoke with JCP this morning and this is something HMRC have flagged up, which, to cut a long story short, is an understandable misunderstanding around a permitted work employer changing their business name and a larger than normal payment registering due to backpay as a result of a delay in payroll processing me as a new entrant. The DWP Officer couldn't have been more helpful/reassuring and said they'd take a quick statement from me at interview and explained what payslips/correspondence to bring to interview.
Thanks again for your advice, which I followed with a happy outcome - greatly appreciated!
Hey Suzy - Many thanks for taking the time to reply and for your kind advice. Happily it seems to beworking out fine as regards my situation and happy it did for you too - I've posted an update on this thread - and I'm not worried about the interview now. Thanks again and Merry Christmas to you!