Although the addresses given may get the FPL to the ops rooms, I’m not sure it gets the information to the ATCOs’ electronic strips, so you will still be treated as if making a freecall. There was an APP for LTMA airfields to forewarn them if your intentions, but I understand that was mothballed post COVID leaving a telephone call to Swanwick as your only likelihood of getting details to the ATCOs in advance. The good news is that a VFR crossing over the threshold should never really be refused (in VMC) and during these quiet times a more direct route through the CTR could even be a offered.