Data rates in the UK for last 12 months: Wow alot of data goes bentween the WNs and SEs...

So with me move to new data and work-flow models as a result of the idea to create further storageless sites and caching sites. I decided to take a look at how large data flows  within the UK. Caveat Emptor: I took this data from ATLAS dashboard and make the assumption that there is little WAN traffic from WNs to SEs. I am aware this is not correct, but is at the moment a small factor for ATLAS. (Hence why I reviewed ATLAS rather than CMS whom I know use AAA alot.)
 

In green are the data volumes in UK disk storage, in red are the rates out of the storage. (In blue is the rate for WAN transfers between UK SEs.) In purple shows the rates to and from the RAL tape system. Of notes is that during the month there was 49.1PB of data deleted from UK storage out of a disk cache of ~33PB. What I note form these rate that the 139PB of data ingest from storage into worker nodes  and the 11.4PB out from the completed jobs is data that would have had to go on the WAN if WNs were not co-located with SEs.