If you plan to use a two-wheel tow dolly (that is with just the two front wheels lifted off the ground and the rear wheels freewheeling on the pavement), I would consider removing the driveshaft.
By towing with the rear wheels on the ground, the rear wheels are spinning the output shaft of the transmission, but as I understand it the input shaft is what circulates oil in the transmission, so there is no flow of oil getting to the output shaft bearings when you tow the car this way.
Gearboxes can survive being towed just on the oil that is naturally retained on the bearing surfaces, but my understanding is the survival rate varies greatly from model to model. If you have any bearing problems to begin with, this is certainly going to make them worse. Eventually, things heat up, and failure will eventually occur. I read a tech-tip recently that indicated the TR8 5-speed transmission is very susceptible, and can't be towed any significant distance this way.
For across town you may get away with it fine. Cross country I would either disconnect the driveshaft or tow it with the rear wheels off the ground.
You may be able to just disconnect the transmission at the drive shaft flange (4 bolts), given there is enough room for the drive shaft to turn freely and you can support the drive shaft at the front end so it doesn't 'pole vault' on you.