Tewkesbury Avenue is part of a 1930's estate in Forest Hill. It's a pity when builders/developers gain approval to build and destroy the look of an area with something that is clearly out of place and out of keeping with the style of the location. Apart from that this is a semi - the other house being 1930's in style will most certainly be affected. If not for the foundation distruption - and subsidence is common place in Forest Hill - but just by the whole look of the the building. Personally I think it's a disgrace that this has been approved. Is there an appeal lodged?
Perhaps the Forest Hill Society could push for conservation status in the area. A bit late now but it will prevent more hiddeous buildings being errected in the area. I agree that you would expect the Green Party to 'conserve' rather than demolish and rebuild. Not very Green - smells of corruption.
Apart from the Victorian streetscape issue (eg. pools and Louisa House demolition) there is a 1930's heritage in Forest Hill that we should also protect.