They were fine on the donor car, so it's unlikely they're blocked / restricted, the additional pump is only £8 so if it works or not, it's hardly breaking the bank. The LR pump part number doesn't change until L405 so there should be no difference in early/late L322's.

I don't have any issues with the standard setup to be honest. The rear is another matter and a spray rather than jets would be a lot better but as the nozzles are integrated into the arm this would be hard to implement. 2012 TDV8 Vogue (L322)

Yep, the standard ones are 'fine', the fan spray are 'better', I suppose I'm in a position where I can experiment for no, or low cost on a lot of changes. If improving the pressure gets to be too much hassle or costly, then I can easily revert to standard.