Different area different rules and budgets. So difficult to answer.
https://www.nhs.uk/Conditions/social-ca ... oters.aspx
Taken from web site
NHS voucher scheme
Some NHS wheelchair services offer a voucher scheme so that you can have more choice of wheelchair. You receive a voucher to the value of the chair you would have been offered after your assessment (which is determined locally in each individual case). You can then put the voucher towards the cost of a chair that you buy privately or in partnership with the NHS.
If the maintenance of the wheelchair remains the responsibility of the NHS, you will have to return the chair when you no longer need it. However, you can opt for private maintenance, which will allow you to keep the chair permanently.
Not all NHS wheelchair services offer the voucher scheme. Services decide locally whether to have a scheme and how that scheme is applied. You cannot exchange the voucher for cash. The voucher is non-taxable so it does not affect any disability benefits you receive.
Waiting times can be between 3- 6 months.
Usually powered wheelchair are to be used in doors for six months. The chairs are programmed as not to use outdoors for long distance. Following, as additionally assessment for out door use the chair is reprogrammed for longer distances. NHS chairs can be more robust and are repaired/serviced by the NHS contractors. It is well worth the wait if a little frustrating. There is a lot of issues to consider which every route you take. Do you need it to fit in a car etc. Does it need to be lifted/hosted etc etc.