Hello,
The UKIDAC RSP at https://rsp.lsst.ac.uk will be at risk from 16:00 to 19:00 BST (UTC+1) for upgrades.
These upgrades are done on the live platform deployment, so there is not a planned interruption to the service, however if any services are slow or fail to load first time, this will likely be the reason.
Thanks,
Dave