There will probably be a question about why you want to work for the nHS...unless you will be front line with a lot of patient contact inthe specific job concentrate more on a) preferring to work in the public sector because you value the service the hospital/clinic et provides to the local community and you want to be part of a successfl organisatiom
2) that the health service has a good record for valuing its employees and you see the role as a first step ...talk about self development plans e.g courses and how you see them benefitting the organisation,
3) you may be asked about the possible impact of health service cut backs...at a grade 1/2 your role is to give value for money by working efficiently and effectively and supporting others within the team. Stress that you are flexible and adaptable as they may need people they can move to other jobs later
4) if you are asked about your strengths and weaknesses your strengths are self discipline, attention to detail, and being a good team player...your weaknesses are you worry about getting things right, and you have set yourself too high a standard in the past but you are more realistic now
Be aware of any specific changes coming up where you work.... they may ask general questions
if they ask scenario questions they are likely to be about how would you deal with a request for a record that has 'gone missing' the answer is to let the person know there is a problem asap while continuing to try to trace it and seek advice from a senior member of the team as to the correct procedure.
At that level you won't be expected to think too much for yourself but know when to refer upwards,
Hope that helps