Hi...Also from UK but living in rural Greece halfway up a mountain.
Bought a good used 500 lwb about a year ago for a runabout on the multitude of dirt roads in the area & a few overnight camping trips.
Happy with the machine & ride is comfortable enough.
Don’t know about UK rules, but was possible to register & insure over here for road use, so able to ride a distance on tarmac as needed between trails.
No problems with this apart from general caution needed with “mud” tyres
But obviously not comfortable over any long distance.