The UK and US versions of this and several other Fleetway/Quality series got out of sync, with some issues being dated differently for UK and US editions until the US editions skipped two months of content, which was reprinted only in the UK versions. This put the numbering of the two versions out of sync so that finally Fleetway/Quality double-numbered the US editions for two issues in order that the numbers and contents of the two editions matched again. See the individual issue records for the specifics.