Hi Angus, my 1.9 16v prestigio auto doesnt go into 6th until about 65-70 where it crusies then below 2k revs, great for long distance cruising and economy. Using the 'manual ' option the gearbox ecu only only you to change at safe speeds for the gearbox and it wont let you get into the gear manually if the revs are too low are high , hence the beep.
These cars are first class if they have been looked after although some problems with the early auto gearboxes. The auto boxes are made by Aisin as fitted in Vauxhall Saab, Volvo and many others.
Problems with auto boxes are gears slipping and jerking changes, solenoid valve problems with some early boxes, improved in later models. I had to have rebuild at 70k miles. Getting oil changed around every 30-40 k for long life seems a good idea. But great value and ride better than many much more expensive cars . good luck John