What assisted travel means here
An assisted journey is an ordinary booking with more planning in it. The driver helps from the door to the car, loads the wheelchair, walker or rollator folded into the boot, and the schedule allows the extra minutes at each end instead of treating them as a delay. You pay the confirmed written fare for the journey — assistance is not an extra on the bill.
What makes it work is the detail you give us in advance: what equipment is travelling, what help is useful, whether the pickup has steps or a distance to the kerb, and whether anyone is travelling with you. Put it in the quote request and the right vehicle arrives prepared.