Get your flat valued first. Even speak to the w**ker agent and get a rough idea whether you can add value to the property. Being in S. London and of course depending on the area, I'd imagine you could add some value to your place.
Then, compare the price of it with others in the area. This in tandem with the estate agents estimate will give you an idea of what you can get.
Adding value though, usually and maybe in your case I would start with the kitchen, then bathroom. Get both expensive rooms revamped as cheap as poss, do any of your own work if you can. If the rest of the place is in decent airy nick then I reckon you'd add value.
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