I seem to think that I have seen a commissioners decision that relates to DLA that states if a person has a permanent illness/disability and is awarded DLA then the award should be indefinite not fixed, or something like that! Could some kind person take pity on me and point me in the right direction! Thanks

You may care to look at this old discussion:

http://www.rightsnet.org.uk/forum/disability/1188.html

Which contains various bits of case law on the subject (a much under-explored subject in my opinion).