There are a lot of Georgian windows in Pinner all dating from 1930s so I am a bit clued up about them. The key question is how deep they are. Some are very deep and are almost impossible to clean without taking for ever and driving you mad in the process. They are also no good for WFP.
Paintwork is critical as well, any signs of chalking or flaking is a big problem. They are likely to be both because its expensive to get them painted for the same reason as its hard to clean them.
You have to clean the frames properly on a first clean because on each top edge there is liable to be a thick layer of black grime that will end up on your cloth.
Shallow Georgians that are well painted are quick enough using the techniques mentioned here but I still have a cut down sqeegie, about 4", that I have had for years and I use for these sort of jobs. You sort of evolve your own techniques over time.
I have always avoided the Georgians around where I live because they are too hard. The first rule of window cleaning for me is to pick easy houses.