Hello AJR - I am sorry to read of your problem.
I live In Gloucestershire, close to the Wiltshire boundary, & attend the same treatment centre as yourself. I first started the diagnostic process in April 2020 with a MRI, & CT scan preceding a transperineal biopsy, undertaken under GA, at my request, when no cancer was found.
Unfortunately my PSA has started to rise & I was referred back to Cheltenham in late September. I had a telephone consultation with a specialist nurse on 26 September & a MRI on 6 October before a very brief, ' face to face', meeting with a consultant 3 weeks later when I was advised that I should have a further biopsy. My biopsy was completed, at Cheltenham, on Thursday 24 November. I was told, by the consultant who completed the biopsy, that the results would not be available for 6 - 8 weeks.
The only letters that I have received from Cheltenham, other than one in 2020 advising that 'no cancer was found', are those offering an appointment. I am far from being an expert on these things but the letter that you refer to following your MRI appears to have been an error. The MRI identifies possible areas of 'suspicion' & as such is the basis of the decision as to whether or not a biopsy is appropriate - the only 'numbers' that are generated by the MRI relate to 'prostate size' & a PIRADS score, which assesses the likelihood of prostate cancer on a scale of 1 -5, where 5, as in my case, is very likely.
Can I suggest that you contact the Urology Department at Cheltenham before looking further at the opportunities for private treatment.
I hope all of this is soon sorted - it is a enough stressful process before this sort of complication.