>"In my company for example...so everything is double the price for no reason other than easier accounting."
I suggest you work out what your day rate would be based on your gross package (including employer NI, employer pension contributions etc.).
Don't forget most years there are typically 251 working days (52*M-F minus 9 bank/public holidays), which are reduced further by holiday entitlement and any other entitlement/allowance you may wish to include.
