I've written to a couple of actors via theatres and I've had replies from most of them. Think there's a post on here which says which theatres/venues do and don't pass on Fanmail which will hopefully help somewhat

I write to cast members on a regular basis at the West End Theatres and probably get 90% success.

Hello

First off, sorry if this is the wrong forum but I figured it was a Via Venue question so this would be the place to ask. I know and have had success with most Broadway theaters passing on mail to casts but do most West End houses do the same? Or is it safer to write to an agent if you know the agent as well? Any tips or tricks would be helpful? If it helps i'm writing to Wicked at the Apollo Victoria