Alan started by suggesting that most of us could also be more discerning about pressing the shutter button. His Rolleiflex costs £5.40 per printed image, thus requiring more discipline. (At that rate I'd have bankrupted myself last Sunday morning.) If you haven't got a film camera, limit yourself to 36 exposures per outing.
The consistent theme through Alan's presentation was to try to get as much right in camera before you start to rely on software for processing. He doesn't believe photography is about software skills. Photography is the relationship between the photographer, subject and camera.
One of the first challenges of architectural images is perspective and converging verticals in tall buildings. Interior work often presents the need to balance very wide ranging exposure values and colour temperature. The download document here lists some of the approaches Alan suggests.
Des presented a number of images shot at BBC buildings whilst working there as an architect. Again, he applies the get it right in camera approach and asks himself for each set up - is it square, is it plumb, is it level? Also overcast days can be more favourable than sunny ones.
My own observation from this evening is whilst we usually try to place our focal point off-centre (rule of thirds), architectural images often seem to benefit from perfect symmetry.