Luke Baldwin scored Blackheath's second try in their defeat by Blaydon
Blackheath slipped to their fourth successive defeat, going down 32-21 to Blaydon in National League One.
Tries from Des Brett and Luke Baldwin put Blackheath ahead, but the visitors notched up 22 unanswered points in eight minutes to swing the momentum.
Elsewhere, Westcombe Park surrendered a half-time lead in going down 30-6 to Jersey and Canterbury lost to Richmond.
Gravesend completed a full set of National League defeats for Kent sides with a 31-26 defeat by Havant.
Sidcup are up to fourth place in London One North with an 18-8 win over Chingford, while Tonbridge Juddians lead London One South thanks to their win at Sutton & Epsom.
Old Elthamians lead London Two South East after their 14-5 win over East Grinstead, while Charlton Park top London Three South East following their 13-6 defeat of Medway.
Sittingbourne head Kent League One after winning 24-10 at home to Gillingham, while Guys' Hospital are top of Kent League Two after a comprehensive 62-12 victory at home to Orpington.
National League One Blackheath 21-32 Blaydon
National League Two South Canterbury 28-52 Richmond Jersey 30-6 Westcombe Park
National League Three South East Havant 31-26 Gravesend
London League One North Old Colfeians 32-22 Thurrock Sidcup 18-8 Chingford
London League One South Beckenham 17-16 Hove Dover 46-12 Tunbridge Wells Sutton/Epsom 7-43 Tonbridge Juddians Thanet Wanderers 16-14 Chichester
London League Two South East Aylesford Bulls 34-5 Old Dunstonians Deal/Betteshanger 59-7 Purley John Fisher Maidstone 16-14 Brighton Old Elthamians 14-5 East Grinstead Sevenoaks 63-20 Warlingham
London League Three South East Charlton Park 13-6 Medway Cranbrook 6-27 Bromley Eastbourne 8-0 Folkestone Heathfield/Waldrom 25-7 Park House Horsham 19-22 Dartfordians
Shepherd Neame Kent League One Ashford 41-24 Vigo Beccehamians 15-39 Old Gravesendians Lordswood 20-19 New Ash Green Sheppey 40-0 HSBC Sittingbourne 24-10 Gillingham Anchorians Whitstable 19-17 Old Olavians
Kent League Two Brockleians 15-6 Old Williamsonians Foots Cray 20-8 Erith Guys' Hospital 62-12 Orpington Kings College 17-8 Shooters Hill Southwark 29-10 Bexley
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