OK, back at work so I've had time to update the sheet
With regards to weights etc - All the information on the sheets has been extracted directly from the manufacturers websites. Where the information hasn't been available, people who own the units have provided the missing data. Most manufacturers only provide the ready to dive weight.
The rough £'s price will obviously change depending on the current exchange rate. I think I used approx 1.9 USD to £1
The PRISM data is still incorrect.