I think we are all a little quirky with how we calculate prices and control documents. The easy bit is the CAA controlled arena because it is uniform.
For me Airops does everything we want, but is bogged down by lots of stuff we dont want, and does not handle document flow well.
For quoting the best I have used for my requirements was flightquote2, it could be developed into something fantastic, but the owner was not interested in letting us partner on the extra modules.
Going back to the spreadsheet (that I rubbished out of hand.....sorry) I would like to see anyones copy of how you deal with lat / long lookup and the gret circle calculation.
Phil