My main research interests are in the field of instrumental climate change. These involve the analysis of instrumental series of temperature, precipitation and pressure measurements taken around the world. Before any analyses, it is important to assess the quality of the data and remove any inhomogeneities that may arise from changes to station locations, changes to instruments, changes to the methods of calculating daily and monthly averages and also potential changes in the environment around each site. The main emphasis in the research has been the development of gridded datasets, on regular latitude/longitude grids. In this form, the data can be more easily visualized and analysed, and subsequently compared with climate model output (from GCMs and RCMs) and also with Reanalysis output. When the temperature grids are averaged, the well-known global temperature record is developed. Gridded observational datasets are essential components in the assessment of GCM output and in the Detection and Attribution of climate change, from anthropogenic and natural causes.