This afternoon, I put my earth-electrode antenna in the garden at the new QTH with the remote electrode against the far fence and the local ground connected to the mains ground in the shack. Check your mains earthing before trying this. Separation is about 15m i.e. a little less than at the old location. On 8.97kHz the current into the ground looks about right and the TX current similar to that at the old QTH. On 472kHz the match seems a little different but I have had several spots from G6AVK at 78km when using low milliwatts ERP. I need to optimise the match on 472kHz.
I am now going to try the earth-electrode antenna on 160m and 80m. All being well I'll do a remote RX test on 8.97kHz to see how my VLF beacon compares.