I'm glad you like Tapastry, as a Spaniard I like seeing tapas bars do well. I do get frustrated though, as the vast majority are nowhere near authentic and would love to see great tapas introduced to London's vast menu of great world cuisine. Saying that, there are a few gems such as Fino, Moro, Brindissa, Barafina.
The best way to judge a tapas bar is by it's ham (jamon). It should be hand carved on request and not machine sliced like Tapastry. The jamon I ordered from there was hardened and plastic tasting at one end, to suggest they were from the fridge and exposed from there packaging. You can understand my disappointment as you notice my 'online name'.
That Green wine bar/restaurant on Lordship Lane do a lovely meat a tapas platter with delicious Manzanilla sherry and salted almonds. Not enough for a meal out but I recommend if you're in the area and need a bite in the middle of bar hopping.
Will take your advice and offer suggestions if I'm round there again.