Turn It Off
"When ready contact radar on xxx.xx" seems like a useful phrase at first, but since whenever most pilots are given a frequency they dial it straight into the box, it is a little redundant. You might as well use the standard phraseology, "Contact X on xxx.xx". If the pilot is too busy he will tell you to standby or he will change frequency but not check in until the workload allows.
If you think you might want to transfer the aircraft quickly from Seaton TWR to Medway ACC, either for your own benefit or for wx avoiding, the best way to ensure a quick change is to do as LL do and use the phrase "departure frequency when instructed xxx.xx". This works well if the next frequency will not be known to the pilot (eg SVFR, LL dir instead of TC etc) and could perhaps find use at PF and PH where we have no idea who we are going to call next to explain why we are flying towards the rising hills carrying out an emergency turn!!
ILS 119.5
You must fly to some pretty laid back places!
All the best
G W-H