To go fishing on the Itchen in mayfly season, you either have to be very, very rich or very, very lucky. That’s why I’m so grateful to have a friend in Mike Daunt, arguably Britain’s best-connected angler, certainly the most foul-mouthed, who invited me up for the day on to a particularly juicy beat of this idyllic Hampshire river to try to catch my first trout ever with a dry fly.