I should perhaps not have used the word "accurate" as it implies that other possibilities could be "inaccurate" which was not my intention. I should have said the locomotives most likely to be used were those allocated to Wadebridge Shed but that other members of the Class would be have been employed in the event of major overhauls or other events leading to motive power shortage.
Your point about the taller cabs is an excellent point as Dapol do not appear to be offering this variant at this stage as the proposed models are 30225 and 30182(P&P fiited) and I gather that the last batch 30227-36 were the tall cab locos so renumbering either of the proposed locomotives to 30236 would be incorrect as there does seem to be a fairly noticeable difference in cab height.