Just to confirm that we received approval from bank 2 weeks ago and all turns out to be good. We have paid booking deposit and waiting to close the sale now.
May be it'll help someone in similar position someday, but as advised on forum I got a letter from HR explaining that I am permanent full time employee and recently moved to a similar position within the organization hence on probation outcome of which will not impact my permanent FT status in the company.
Happy days and thanks again everyone...