Inclination, declination, and relative palaeointensity calculated as a composite (WINPSV-12K) of four sediment cores (+54-03/57PC, +54-03/64PC, +54-03/67PC, +54-03/68PC) from Windermere, UK, spanning the Holocene. The inclination and declination are reliable, but the RPI is not reliable and should not be used in publications. It is made available for those who wish to plot it anyway.For each variable we have included the calculated values and the 5% and 95% confidence envelope limits. Values are calaculated for every 50 year timestep.