Purchase Leaseback

Hi,

I'm French and live in the UK. I'm considering buying a flat in leaseback. This flat has been acquired by the present owner 6 years ago. The contract will terminate within 3 years.

How can I be sure that the management company will renew it?

Also in that case, I believe the VAT has already been deducted from the selling price. Should I have to wait another 14 years before being able to sell the flat without having VAT to repay to the French Government?

Last concern, although French I am a UK resident. In terms of tax, does it mean I am consider as a non-French resident full stop.