would anyone mind if we swapped from red to white diesel?

Really? The 60 / 40 split is standard and applies even if you dont have a heater on board

No it doesn't. You are supposed to make a declaration based on your probable use of the fuel - the 60/40 is a statement from HMRC regarding the level of heating usage that they regard as plausible and will not bother to investigate. In the recent cold weather, with the marina lock closed for maintenance, we declared 100% heating and got the rebate on the entire tank full.
 
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