I was a bit disappointed with my last two forays to Ealing as a visit to Sushi Hiro was always a favourite treat (I thought the itamae had finally had enough - he always did seem a miserable sod ).

My liking for sushi was developed at Noto Sushi Bar in what was the Yoahan Plaza in Colindale. Alas, those days have long gone. The Yoahan Plaza is now "Oriental City" and has a fraction of the Japanese produce that was once available and at only a fraction of the quality . 'My' friendly reasonably priced sushi bar is now a 'proper' restaurant and the charm has evaporated. EDIT TO ADD - Even Oriental city is now no more

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Current recommendations:

I really like Edokko (50 Red Lion Street, London, WC1R 4PF)
For London, the food is very good and very reasonably priced.

Yoshino - just off Regent Street is rather nice, nothing spectacular though. www.yoshino.net/ Not too expensive either.

And for Izakaya type fare: Aki, Grays Inn Road

I tend to order sashimi rather than sushi now. What I notice in great sushi is the extraordinary qualities of the rice and how it has been seasoned, and the way an itamae can 'blend' the rice and fish so it fuses into a melting, 'fleshy', whole in your mouth. In some ways, I believe it's more often the rice that lets down a piece of sushi rather than the fish. (I think the rice served at Yo!Sushi is dreadful BTW.)