Hey mate. PGP is an encryption tool that will allow you to communicate with a vendor knowing that only you that them can read the message. They will get the same address either way the only difference is how it gets there. I think when you enter your address without PGP LB has its own encryption too.
It is very likely any delays are being caused by RM due to the time of year, I know we've all been experience longer times on non-tracked packages. Hopefully yours turns up sooner than later!