What is needed to provide secure place for parking at Caroline's house? Option s could include 'breadbin' lockable on-street units (2 per parking bay capacity up to 10 bikes).
If she had a Motability car she'd automatically get free parking space for it - so half a parking space for parking the trike seems a fair deal, but for the dumb bureaucracy or rigged system to benefit car makers, that will pay for a car but not a cycle*, and bend over backwards to provide parking for a disabled person's car but not their cycle. (are CEC reading this?)
* Couple in miners' cottages near Durham wanted to get Duet wheelchair bike, which could be parked in the back yard, but Motability refused and insisted only option was a car, that cost more to state, and to users, and which required rental of a garage, some distance from the house, as nowhere to park outside with limited options to stop and get disabled partner out and in to house, and then take car back to parking place.