"Exploiting the working population"

I have been asked to leave a review of this gp surgery. I am in a difficult position at the moment where I have torn my tendon and require emergency surgery but I wanted to obtain a second opinion before having this potentially lifechanging surgery. I took out private health insurance for this and asked gp to fill out a quick form to help me gain a quicker appointment for the second opinion. They are charging me £50 and refusing to give the form without payment. Moreover, they are only accepting cash which seems to be quite fishy! these are difficult times and rather than helping patients, trying to extract money from them at difficult times. What is one supposed to do when I need a second opinion urgently and the nhs takes months to respond to any referral. Pure exploitation, and the gp also did not tell me that there would be this fee to pay. The reception staff also seemed unsure whether to pay the fee or not - miscommunication is a big thing at this gp surgery and it is always a hassle to get anything done in a timely manner especially in an urgent situation like this where I am desperate. Very disappointing.