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Many thanks for the reply, but the primary issue I need answering is in relation to this restricted access to the flat for furniture bearing in mind the flat is marketed as unfurnished. I really feel that this flat should have been marketed as having restricted access. The Landlord denies any problems but is hardly likely to admit to a problem...
The other points are ancillary but useful to know.
Many thanks for your comprehensive response to my questions. Please don't be sorry - it's good for me to have clarification and at least I know where I stand. I shall look into the surrender of tenancy point though as I can only ask...
I will rate your service as excellent.