Do your medical tests and depends which area you live in london. I did mine in Harley street at oxford street in april 2007, in june requested for my passports and 20th July 2007 requested to go and collect my passport. Though I live in london all the processing i did from africa.
Good luck it will be roughly 3-5 months i f it has to delay.
question to martha marita..u said u lived in london but did all the processing from africa. so does that mean u did ur medical exam in london even though ur app was being processed in africa. what address did u give immigration?