Yes the cargo dept use this message to transmit what cargo they are sending and it is used to produce LIR... we (traffic dept) would also send to CLP a required baggage bin breakdown that would be needed based on a formula in relation to booked passenger load..... they then use all this info to produce LIR.
No the destination station didnt receive a copy of UWS.... once aircraft has departed and LMC's have been action, CLP would produce an LDM and CPM and this would be sent to all stations that needed to know what the aircraft contained etc.
LDM = load distribution message what weights are in what hold and males/females/children/infants etc
CPM = Container pallet message, what bins/pallets are loaded where and the weight of each item, this would also contain details of any special loads/dangerous goods etc