This is from the above link :
Any change in policy that increases entitlement may incur additional costs and impact on access to ‘passported’ benefits delivered by DWP.
Under current DWP administration, clients in receipt of disability benefits may be entitled to additional ‘passported’ benefits and DWPpremiums where the disability benefit acts as a ‘passport’ to automatic entitlement of additional benefits or premiums. If we were to introduce a mobility component to Disability Assistance for Older People, DWP may not pay these reserved premiums or benefits.
There is also a risk that, should eligibility rules diverge significantly from current DWP rules, Disability Assistance may not continue to be recognised as ‘like for like’ for passporting purposes. This would put all reserved passported benefits at risk for clients eligible for Disability Assistance. We know that these passported benefits are very important to many people receiving Disability Assistance.
This seems to be saying that they don’t want to interfere with the passported benefits associated with DLA currently. So, those that are entitled to mobility payments via a passport system currently (Over 65) will still be able to do so. There won’t be a separate mobility benefit for over 65, as there isn’t one now under DWP rules. I think my understanding is right, but feel free to question it. It would be a further enhancement of this strange new world if an SNP government took benefits away from a minority group whilst a Conservative government continued to offer them.