A new page provides an example application for RTTOV and RadSim where  real and simulated satellite imagery are compared, The simulated imagery uses Met Office UM  fields which are pre-processed before being passed to RTTOV. See the news feature, Simulating satellite imagery to verify NWP models for forecasting. A new version is being developed which uses RadSim. This will negate the need for pre-processing the model fields and therefore it may be possible to use data from other models.