The SkyDemon plates are a great resource collecting most of the required information about an airfield together in one place, however it only gives a single runway length, and not the TODA and LDA, and this can make a significant difference. For example, according to both the AIP and their website, Derby (EGBD) runway 23 has a declared length of 523m with TODA 585m and LDA 306m. According to the SkyDemon plate, Derby runway 23 has a length of 547m, which is none of the figures given in the AIP, and certainly not the most limiting!