Bearing in mind your water pump will vary in speed by the same factor as your rpms, i.e over 8 times faster at redline than idle, a small % increase in speed is unlikely to make any difference.  Your issue is most likely coming from poor flow (hopefully solved by the citric acid), or a short circuit.  I'd look at both of those as culprits for major temperature issues, pump speed will be the final few % of improvement you can search for when optimising it.  It also looks like your raidiator is fully shrouded, and I can't see if you have the shrouding boards in front of it, could this be limiting airflow? Of course advancing your ignition can help, and taking off that pops and bang map will do wonders too 😜

Thanks all for the feed back! I now have some new options to try, specifically flushing the block with Citric acid mixture.  In closing if anyone has an opinion on going to a smaller water pump pully, i would like to know your thoughts. Andy

Egret If you can find a Stanpart 134681 Thermostat housing cheap, you can drill and tap-it for temp sensor. The cast metal quality of the housing I have was pretty poor so needed to be careful drilling and tapping. Attached picture is sensor that feeds my microsquirt ECU. The location does place the sensor on the engine side of the thermostat which I like, some don't.

Looking good Michael. Those tracks look the mutt's nuts too

Alexi Sayle is excellent. Mr Roberts Is a favourite and would work as a slightly older kids story but is full length 

I’d say your results speak for themselves…..

Thanks - not come across those so will investigate 

So has Alexei Sayle. I heartily recommend The Dogcatcher collection, although the last story, the eponymous Dogcatcher, is maybe a little too repleat with sex, profanities and other 'adult themes' for young ears. Come to think of it, none of them is suitable for young ears, but they're excellent for adults!

Same here. Never took to him, as a child or adult, and both my kids were the same.

Provided the temperature doesn’t “run away” causing boiling over its probably not worth getting too hung up on. Vitesse runs quite hot (95 - 100C) when running fast in hot conditions, but cools off when I back off. It also gets hot when labouring up Alps behind camper vans but cools off when I get past them and go a bit quicker. It’s never actually boiled over though it must have been close a few times!