Subject to circumstances and wifely approval

I am planning the mother of all BX journeys (well, it might be!

), although I might end up using the BX for two of the four legs...
UK, Dover to Calais/Boulougne, France. Then down to Agen, SW France. Rendez-vous with mate and head off, via the Alsace and Germany to a little village in the Czech republic via Linz, Austria. From there, go to Poland (probably give the car a rest and go by train), and eventually back to Agen. Back up to Calais/Boulougne, or, wherever, and back home. The legs from Agen to the Czech Rep. and back again might be done in his Toyota Avensis (yawn!) but I will try and persuade him otherwise!
Mind you, I have to get to Agen first and door to door that's about 620 miles each way... The total trip's likely to be 4,000 miles. Done in about 18-20 days.
I'm sure the car'll be up to it - well, it should have been thoroughly serviced

and any niggling faults/wear issues dealt with by then.
And with AA cover and so on and careful driving it is possible. Surely?!