Can a patient who is paying £1000s request a stronger sedative prior to surgery?

Local anaesthetic and sedatives. My understanding is while having local anaesthetic one can request a sedative along with it to decrease pre op nerves. I had a consultation with a surgeon last week who stated they give a 10mg diazepam pre op. I had a spell recently of using diazepam frequently to help with anxiety related issues but built up quite a tolerance. I'm worried the 10mg diazepam would not be enough to relieve my pre op nerves. Can a patient who is paying £1000's request a stronger sedative prior to surgery? TIA