Malvern site on 18 April to view progress on the microwave radars and mentioned the problem to Lovell. He was particularly frustrated by a raid carried out the night before on 16/17 April on the Škoda Works, where 11.3% of the attacking force was lost due to enemy action and all other issues. Mentioning the problems with Monica and especially the AGLT, Saward told Lovell: Lovell was aware that this was indeed possible. The team promised they could build a sample of a special display that was effectively the opposite of the main mapping display; instead of adjusting the display so the centre-zero was eliminated and thus provide maximum screen space to the map, this new display would adjust the size of the centre-zero until it filled the display, thus making the returns from other aircraft easier to see. They only asked that the "whole affair was to be kept quiet to avoid difficulties". Saward supplied an electronics technician, Sergeant Walker, and two mechanics, all of whom arrived the next day and immediately set about building a display in Halifax BB360. The basic idea was to use the delay timer that reduced the size of the centre-zero as a switch; the existing display would receive returns exactly as it had before, with everything before that timer being suppressed, while a new display would receive everything before that time, and could be adjusted so the centre-zero filled the display. This would result in one display showing everything in the air, and a second providing a ground map exactly as before. The first experimental system flew on 27 May with a Mosquito providing a target. The Mosquito clearly appeared on the display, and photographs of the display caused much excitement. When the photos reached the desk of Bomber Command's Deputy Commander-in-Chief Robert Saundby, he immediately sent a message to the Air Ministry demanding that they be installed with all possible speed. The new display, given the official title Type 182 and nicknamed "Mousetrap", was on the assembly line by August 1943. At this point, the team received a message demanding they immediately stop using the name Mousetrap as that was the name of an upcoming secret mission. They were officially allocated the new name "Fishpond", a choice that was made official by a telegram from Churchill on 9 July. The first operational units went into service in October 1943, and by the