You actually have 3 ways to start your property search:
Estate Agency
PRO
perfect if you have a particular area in mind; you deal with only one
persons; they make an initial selection for you; you can build a sort of
fiduciary relationship with the agent; they can combine multiple views
and take you around with their car.
CONS their clients are the
vendors so they don't really work in your interest; they try to sell
first all the undesirable properties in their portfolio; if you are not
clear from the real beginning they show you a lot of non relevant
properties;
My experience with London agencies:
Foxton is
the most expensive for buyers (there is no actual commission for buyers
but it's well known that it's pretty much added to the property price).
They have almost 40% of the properties on the market in their portfolio
so sometimes it's an obligatory choice. Very polite agents.
Green and Co young and keen. Affable and not too pushy. Fresh and good service.
Pembertons
No transparency whatsoever. Felt screwed over for a good 3 times.
Arrogantly pushy without Foxton manners and politeness.
Faron
Sutaria very professional and not insistent at all. You have the clear
impression that they deal with only certain type of properties
Jorgensen
Turner they tend to communicate a lot by phone or text messages, a bit
'old style' service. They deal a lot with still underdeveloped areas,
like Kilburn.
KFH they tend to deal mostly with new or just refurbished properties. This reflects their type of clientele.
Marsh and Parsons they deal mainly with large and therefore relatively more expensive properties.
Barnard Marcus: they have often purpose built block and council houses properties in their portfolio.