You need Pitsford Pirate fly lines!!!
All teasing aside; I think that so long as you have a decent range of flies and fly lines (floater, inter and sinker) and ask the rangers/bailiffs as to what is working and where, you should do ok.
Mr Edmunds, as above, is a noted top level angler and you would always do well to take note of what he says.
Typically, bailiffs/rangers/fishery managers should generally be able to advise you as to best areas and tactics.
Best of luck and look forward to a report back.
I also believe that many people use 'rutlandgillies' for up-to-date reports.
See below if I have copied this correctly or google it and look at fishery reports for Pitsford.