I've been in London on and off for 4 years and have not come across any where I can buy really good full and half sour kosher style pickles. NB. I've only been to golders green once.
Also been to Harry Morgan's but can't remember if they sell pickles loose or of the full sour variety
In Paris I go to that yellow fronted store on Rue de Rosiers for amazing cornichons and I just returned from NYC where my I devoured a few pints of mixed pickles from the pickle guys and few more from gus'
Thanks in advance