Limehouse works well. Cruising Association
bar welcomes visiting skippers, and some of the events
organised there are open to non-members.
planning library (charts and pilot books
for the whole world) is the best such resource in existence, but that's only open to members. May be worth doing for you - adds £80 to your wintering costs for a year if you're a Dutch resident. That gives you a quarterly magazine, weekly talks over winter on a variety of topics, and Agnieska's buffets. If you're doing much fitting out there's a formidable list of suppliers which offer discounts to members