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The PR Mk IV was a photo reconnaissance conversion of the Mosquito B Mk IV, a somewhat ironic conversion when one remembers that the first B Mk IVs had originally been ordered as PR aircraft. The first two conversions were performed by the PRU between April and June 1942, at the same time as four PR Mk IIs were converted from the night fighter Mk II. The Mk IV was rather better suited to the PR role – it could carry extra fuel in the bomb bay and under the wings, giving it a potential range of 2,350 miles. In all 31 PR Mk IVs were produced by converting Mosquite B Mk IVs, serving with Nos. 540 and 544 Squadrons after those units were formed by a reorganisation of the PRU on 19 October 1942.