Hi Les,
On the government website it seems to work this way, however there are rare circumstances where changes have been made, where no assessment is ever required again, due to the disorder or multiple disorders and clarified by Consultants where no more assessments would ever be required. I have only found one case where this was the outcome. A Tribunal Judge can issue a maximum length of 15 years, with a re-assessment at 10 years.
How it will work in practice:-
7. As part of the objective assessment, the trained independent assessor will provide a recommendation to the Department on the duration of the award, based on the individual’s particular circumstances, the evidence that has been gathered (including that provided by the claimant) and the likelihood of their condition changing. We will provide a framework for award durations to assist the assessor when providing their recommendation to the Department.
8. Durations would be based on the likelihood of changes – either an
improvement or deterioration – to the disabling condition itself or the impact of the condition on the individual.
9. Shorter-term awards (up to 2 years) would be used where significant improvement could be expected in that period, for example where conditions improve with time or treatment; and the barriers the individual faces may reduce.
10. Longer term awards (e.g. 5 or 10 years) would be used where changes are less likely but possible. For example, where some improvement is possible over time or where the needs of the individual are likely to increase.
11. It is anticipated that ongoing awards would be used in a small minority of cases where changes, either positive or negative, are unlikely. For example, where improvement over time or in response to treatment or rehabilitation is unlikely and where the needs of the individual are also likely to remain broadly the same.
It would be nice to see DLA to PIP with no f-2-f, but these are few and far between, the assessors have only a certain number of claims per month where this does happen, it is rare.
I'm still on DLA and just changing vehicles, that used to be straight forward - now I found Motability have problems with the dealer I am currently with, therefore there is talk of extending the lease on my current vehicle.
I have to spend quite a lot of my High Care Component on Service Charges a month. This is for adaptions done to the property which were covered by a Disability Funding Grant (DFG). However, after the 12 month warranty I have to pay Service Charges, they soon add up because most are over a 3 year contract.
The Clos-o-mat I had installed was £3,100 on a DFG, then that is followed up by payments from my care component of £180 a year!
You certainly do not see drinking alcohol or smoking, I'm on 36 meds a day, which is under review after a 3-day in hospital.
How people on DLA or PIP can afford holidays I'll never know! These days I couldn't leave this premises, apart from doctors or hospital appointments - thats all I really go to, but I have so many follow-up appointments in a month it's ridiculous.
At the moment I feel really ill - due to a drug which has been stopped in production, I've been on it for over 30 years! Course there was no mention of it being stopped anywhere. My doctor tried me on alternatives and put me in hospital.... I ended up doing my own research online, phoning the local pharmacist then phoning the pharmacist at my doctors surgery to give me a prescription for the drug. He was amazed that I had seen two GP's and a Neurology Consultant and found another alternative myself. In hospital I was asked if I was a doctor! lol This is how bad the NHS is, it is well under-staffed and my local hospital is rumored to losing nurses in the new year!
My apologies to Sarah, for hijacking your topic and post! 
Regards,
Les.