Unfortunately NGC and PCGS graded these £5 as Proofs when they were in actual fact released as BU coins. NGC have graded quite a few as proof along with the strike on the day sovereign but have since stopped the proof designation after releasing they were in fact BU struck coins but the damage was already done.
The RM had released some of these coins with a COA that stated proof on it and after realising their error sent out letters asking to swap the COAs out for a correct one stating BU.
3 coins were released at the same time, 5 sovereign, a Piedfort Sovereign and the strike on the day sovereign, only the Piedfort was struck as proof, coincidently, a proof is struck 6 times and not 3, , specimens are struck 3 times and BU once. Attached is my piedfort designated PF70DCAM