We got the sushi rice in the local asian food store that seems to have everything. Including some frozen Thai sticky rice with Durian which Albatross reminded me of. My daughter, the self appointed specialist in sushi burritos, said that it won't be worth eating if we don't have Japanese Mayo. So we bought a squeezy bottle for £4 at the Asian supermarket. Did a taste test and the difference is barely noticeable, we could have easily bought Hellman's and added a bit of sushi vinegar and sugar. We also threw away all the soy sauce and wasabi that was 7 years out of date.
After spending tons and making a special trip for the mayo, the teenager pouted and sat there with a face like a smacked ass the whold dinner.
Other than the mayo, we could have bought everything at Tesco. Seaweed, vinegar, ginger, they've got everything.