Thanks for your reply.
As regards ***** ***** arrears, a Freeholder is only entitled to claim arrears for a period of 6 years. Therefore, you do only need to pay the last 6 years rent.
As regards ***** ***** to buy the Freehold, there is a set formula used, based on the value of the property and how many years are left on the Lease.
Most Leases were granted for a period of 99 years, and if you have been at the property for 58 years, I am only guessing, but there may only be 40 years or so remaining on the Lease. I don't know the value of your property, but if it is between £120 to180,000, you are looking at a very rough price of £8,000.
You will need to take advice from a specialist Surveyor to advise you specifically on the price.
I hope this assists and sets out the legal position.
If so, I would be grateful if you could rate my answer.