I have an old TomTomXL which I found while having a clearout, it is only 1GB so it will not accept European maps but I have installed the latest TomTom GB & Republic of Ireland map on it, the latest speed cameras and 9510 navcore etc
unfortunately, I don't have the windscreen mount, I would put a metal disc on the back and use a magnet mount
I don't know how good the
battery is but the charge port is OK so it can be left plugged in, on the plus side Jane will tell you where to go
I don't want anything for it so if you want it as a back up it is yours
edit:
I wasn't thinking clearly and forgot it has an SD card slot, if I can find an old 2 GB SD card I can put Europe maps on it, you can have it FOC either way