Afternoon all. I’ve recently returned to birding after a three-decade layoff, and after another morning struggling with juvenile and 1st-winter Herring Gulls on my local patch (Ruislip Lido) I’ve realised that I need some help. I’ve read about London’s status as a hotspot for Caspian and Yellow-Legged Gulls and would really like to join any local experienced gull-watchers for a day or two to get some ‘in the field’ advice at a decent roost or riverside/landfill location. Happy to travel and fit in with anyone’s schedules - and supply copious tea/coffee as required! Thanks in advance for any help!