Thanks for replies. JonR you are sooooo helpful. I've not seen them at applebees or aberdeen seafood but then again i've not looked for it before. Was also a bit scared of the cost from borough market but now my sister has found it for me at £2.50 each in Ramsgate (buying over the internet was going to cost me upwards of £25for 2 with p&p). Ok not Central london but as im going down there at the weekend thats my problem solved.
I presumed you meant octopus to cook, but couldn't be certain. there's a nice fish shop on Morning Lane, just off Mare St, central Hackney, (just across the road from where I work) which could probably get you some, on order.
There is an absolutely excellent fish mongers on East Street. If you're coming from Walworth Road it's on the left hand side about 150 yards in (there's another on the right almost opposite). I buy from it at least twice a week, it's cheap, the selection is huge and there's always two or three things that are spankingly fresh. And to cap it all the guys that work there are really friendly. I've bought mackerel, herring, sea bream and mussels recently. They had octopus on Friday, but I bought razor clams instead. They were xcellent, and £7.99 a kilo compared to over £16 at Appelbee's!!