msdj did you put in a proper appeal? I would speak to your MP if you have had no joy from your appeal after such a long time. I say that as I have a friend who was turned down, appealed, kept hanging on for both DLA and PIP and turned to his MP as he lost the mental ability to fight on his own, the MP kicked up a fuss about it. I also think the MP gave ATOS a kick up the ass for matilda too didn't he matilda? I would say you need to re-apply for PIP now. And don't fill the form in on your own, as it's not just about writing down what is wrong/how it affects you, it's about writing it down in a certain way to emphasise the negative and to concentrate on the areas they look at. it needs to be focussed, structured, and clear with evidence and that is so hard to do, so seek advice when completing it. If you are having morphine, and injections several times a year, then your mobility is clearly not great, and as you said, memory means you need more care etc. But it needs to be spelt out according to a checklist, like applying for a job, you need to score points and there is a technique to that.
tough i have my lovely blue badge! I do love it. Although I did get a £35 fine for parking in a 3 hour car park without displaying both bits. I appealed on the grounds of being a novice user and they just reduced it from £70 to £35. fuckers, so that's some way to paying for the rest of my parking 
It's been fab for work though, as sometimes I can't get the bus and instead of DH driving me in, I drop DD off and drive in for 9:15am and can park in the all day council run car park literally opposite my work, 10 steps into my place of work. I don't always use it though, if I have a good day, and feel reasonably mobile I will leave the disabled spaces at the front of the supermarket for someone who is much less mobile than me, but there are days when I simply cannot walk to the trolleys without pain so I will not have a problem using them then. It also makes the difference when I take the children to their swimming lessons as there is a little known disabled section near the leisure centre which is round the back but two seconds from the entrance, or the main carpark is a good 2-3 minute walk if I am lucky, and I have to walk a mile once in the lisure centre to the changing rooms! I have no idea how the hell I managed for over a year unable to walk far, without the blue badge before I stubbornly accepted I needed one! And it makes going to certain places easier such as Eden Project and large children's adventure places, where the carparks are huge and far from the actual place. Eden in particular is spread across like a mile of carpark, and I went without the blue badge one time, by the time I got to the entrance I was ready to go home I hurt so much and the next time I had the badge, it took 30 mins and huge amounts of pain off the trip, especially at the end when I was in a lot of pain from hobbling around the place and could just fall into the car.
msdj you can apply directly to your council for a blue badge. it is easier and more straightforward if you have DLA/PIP as it's automatically approved once you apply then, but they still will consider your mobility even without the DLA/PIP as they will call you in for assessment. I know several people who have a blue badge but no DLA mobility (their issues are bladder/bowel related rather than mobility related) and they applied direct. Although it's not a huge amount financially to help with the impact of your pain, it might help a little? If you drive, you will have free parking, and if you use public transport, buses are free (possibly after 9am?) and you can get a discount card for trains too if you use them often.