friendofdorothy
not sure i've done an nhs interview, but do they go in for the 'competency based' interview style? a lot of larger organisations now do.
broadly this means the interview questions will be more like "tell me about a time you did X" rather than the traditional "what would you do if X happened?" sort of thing
'STAR' (Situation - Task - Actions - Result) is how to answer this sort of question, as is emphasising what you as an individual did. And the action / result bit is the most important.
May be worth a bit of research - there's a fair bit on the interwebs.
And if they are feeling really awkward, there will be an additional "what would you do differently / better if you had the same situation again?" bit to the question.
At best, this sort of interview mean talking about work you've done in the past. At worst, it can be some HR individual who knows bugger all about the job asking silly bloody questions like "give me an example of a time you provided excellence in customer service" and if you don't have one polished answer which includes all the buzzwords they are looking for, forget it.
In theory, all the capabilities they ask questions about should be things they have asked for in the job advert and / or the 'person spec' or whatever they call it. It's worth thinking of a suitable example before you go for the interview rather than - and it's "one example" so it's hard to demonstrate a depth of experience over time...
With local authorities, the application form stage is deciding who to call for interview, then the interview stage is a new 'competition' - in theory, they don't form a preference before the interview then use the interview to confirm (or otherwise) so don't be afraid to repeat stuff that's in the application (although if you have already given examples of doing X and can come up with another example that's equally good, then go for it as it demonstrates depth of experience.)
Hope it goes well