Leasehold detached house advice buying the freehold

thinisaz

Good evening,

Just over two years ago I purchased a home with leasehold of 250 years.
At the time the housing company told us that I would be able to buy the freehold after 2 years for a couple of thousand pounds.

However, within that first two years they sold it on to another company who are now my landlord.

The cost per year is currently marginal at £100 but is due for assessment at the end of the year and will be increased based on PSAEI every ten years.

The way the instead is works out is shown as follows,
A
R x -
B

R is current rent
A is the most recently published figure on the first day of the review period in question of the PSAEI all employees
B is the index figure last publish at 1st January 2013

So, as I see so many oats about horrendous rent increases over the years what does this increase mean for me?

If I were to purchase the freehold would the rent charges be gone for good and do I take full ownership of the land?
What is the best way to look in to the costs to purchase the freehold?

I did an online calculator which estimated the cost would be around £2000 but it didn't state of that was for me to own it outright, if the lead becomes mine after 250 years, if I'd no longer pay rent or what other costs would be incurred.

Any advice would be gratefully received.

Thanks