I have just been going through all my current information regarding the Britannia's and for one sickening moment I thought that I had made a major boo boo on a rename. I used Apollo as the donor loco for 70019 Lightning. On reading one book I realised
that Lightning was one of the class not fitted with a speedo during it's life. Apollo was one of those retro fitted. Now was my Apollo fitted with a speedo or not? As I cannot have all my Brits out at once I thought that Hornby had done it with speedo. Luckily
Hornby had portrayed it pre speedo so I was correct. Looking through all my books more closely to see which had battery boxes and extra tank on the footplate and which didn't, I found even more variations. 70004, which is my latest acquisition, had part fluted
connecting rods and part flat rods. There were many other variations such as the additional front step under the smokebox. They were of varying design, with some having a thicker centre and others thinner. It looks as if the whole class varied in some minor
detail from sister locos in very small ways. I have now sourced Westinghouse air brakes (early life) for 70043 and 70044 if I decide to have a go at modifying those from donor locos. I am undecided as to whether I should fit them (it, the pump) to the latest
version of Britannia or to just leave it alone. There appears to be a photo of 70009 with a white roof, but as the photograph is black and white it may be a pale grey on the outer edges. The loco is in an ex works condition, so it is not just the light reflecting
from it. On the subject of Earl Haig 70044, The back loco bogie has older bearing covers in the photos of it that I have and not the Timkin flt faced cover, painted yellow with red stripe. There is also a small cylinder under the cab. Apollo has had 3 different
variations of cylinders, first without any cover on the top directly under the footplate, then with a rounded off cover and finally with the more common square version. Today Britannia has non!. The class had various lengths of Vacuum pipes at various stages,
from those above the buffer to those below. One interesting thing that is not intentionally modelled is the ATC on some locos could be where the front NEM pocket is. It's also worth noting that the "Bash plate", to protect the AWS system was not fitted to
locos without AWS. Hornby include this in the small parts pack but it may not be relevant to the modelled loco. Quite a variation in these locos is evident and this list is not the end of the variations, just a few.