if i was to get that tube do you think i could get a taxi over to Hackney handy enough when i get out ?
I'd imagine the further away you can get from the arena the better for both getting a taxi and not getting ripped off by one. I don't know London that well but looking on the tube map Stratford doesnt look too far from Hackney so I'd say thats your best bet.
It's fine getting from Stratford to hackney there'll be loads of cabs round there, I'd just avoid getting any cabs from right outside the venue as they'll try and knock you. There's loads of buses running too if you get the chance just jump on one get away from the venue then get a cab.