Welcome.
Firstly, before going to any garage, you should familiarise yourself with the model of your vehicle. If you walk into, or phone, a garage and say you have a Range Rover Vogue, they will know you haven't a clue, and treat you accordingly. Secondly, there are many air suspension faults, narrowing it down a little might help, and may even save you a trip to a 'mechanic in the north west area'. Finally, a search in the Regional LZers section might bring something up for you.