Hi,
The cost of the conversion was £1600, but the installer admitted it took a lot longer than he expected ( it took 7days he quoted 3days).
I thought he was being optimistic but told him to take as long as required, and not to rush it.
He has made a very good job of it and I will post some photos.
the quotes I had ranged from £1600 to £2750.
I reckon I will pay for the job in 18months.