Its rather difficult to be specific because it all depends on your local authority (LA). Some are better than others. They are essentially trying to evaluate your needs and match them with the available services. Obviously some areas will have far more services available than others, both for carers and sufferers. However, in order to access any of these services you have to be evaluated.
It will be helpful if you can be as honest as possible with them - you get no points for being brave. If they offer something you don't want, you don't have to take it, so don't worry about that. A decent evaluation will also make sure that you have applied for everything you might be eligible for - e.g. attendance allowance.
This assesment is to find out was services are available including things like meals on wheels, home care, respite care etc. There should be advice on financing and making sure you are claiming correctly. It is also important for the social worker to make sure you can cope and are getting all the help you need as a carer - they have a resonsibility to assess this. The quality of the assesment does vary and a lot of it is down to the social worker you are allocated.
In our case (within Dorset at the time) the local authority did the assesment even though we were not entilted to funded care. In the end we had to pay for the day centre and other services but the assesment was really helpful as the social worker made it very clear which services were available and which would be suitable for dad at the time.
Please post if you have any other questions and welcome to talking point.
An assessment should be a holistic overview of the Client's situation as well as the carer. The type of questions that are asked are, or should be, around the daily living situation and what the difficulties are and what you would like to happen. From an assessment, a 'care plan' is discussed - could be services like day care, respite etc. There is never a solution to all the problems and bear this in mind - I say that because I sit on both sides of the fence, my Nan has AD and I do these in my area of work - there is only a limited amount of resources. Ensure that you are given very clear information from this too.