Speaking as a Norfolk born old boy - if you require good fuel economy from the car leave it LHD - she's likely to be a little more circumspect with the loud pedal.
On the other hand if you want to give it spirited airings go for the RHD conversion..
I'm lucky to see 27mpg out of Mrs Polo GTI's 1.8Turbo she only uses the RHD pedal...
Now how do I go about converting it to LHD