'Upgrading' to skinny tyres pointless for London commuting

I’ve decided I don’t like 23’s any more after slipping on mine on some road debris the other night. 25’s all the way from now on (in London anyway), I can’t be doing with ANOTHER thing that makes me feel anxious while I’m riding.

I have 23's that grip much better than 25's in corners. Tyre choice (not size) and riding technique are more likely the issue.