Okay, the first 2 units from the Celeron are in and it was slightly surprising until I reread the speck for the benchmark rig which states that SSE is turned off this obviously has a big impact on the folding performance as my 2GHz Celeron has folded 2 different unit types one with 25000 steps which took 59.25 hours to complete and was worth 338 points (5.7pph) and the second was 5000000 steps (yes 5 million!) and that completed in 35.2 hours for 165 points (4.7pph).
Obviously from this we can see that the is some variability in the pph depending on the type of unit being processed but for my Celeron 2 units completed so far we have
338 + 165 = 503 points
59.25 + 35.2 = 94.45 hours
503 / 94.45 = 5.3 points per hour
On a side note I also encountered a different SMP unit this week 1000000 steps which completed in about 22 hours for 1148 points so 52pph this is lower than I receive for the 500000 step units but that is the first and only one of those that I have encountered so I'm not going to worry about it over much!
Right will no update the main post to reflect these findings
I will edit the first post to include this info now