Hi Partime.
Your 3 Coat-of-Arms are very nicely centred.
My copy of the £2 roller flaw is off-centred, it is extremely difficult to find one that isn't off-centred; I've been looking for a well centred copy for many years (8 years) and came up zilch.
Below is the roller flaw from my collection.

They are listed under 271d in the 2015 ACSC and catalogued at $450, I paid $395 for mine, there is one currently on the market in MUH for $250 (I'll be looking at that stamp tomorrow to see if there are no hidden nasties, this particular dealer is notorious for selling hidden surprises).
A few years ago I bought a MUH Tasmanian 1880 1/- Stamp Duty depicting the Platypus from this person. Well, I thought it was MUH, it surely looked like MUH under a normal magnifier.
But I like to be thorough, so had the stamp sent away for a more detailed investigation, the result, it was cleaned and a very small ink smear on the edge of a perforation was indicative of it being cancelled.
The stamp cost me $100, it was worthless, I took it back to the dealer with the test result and got my money back, but kept the result, when I find the document I will post it.
Your £2 roller flaw is a very nice stamp and scarce.
Rob