well you might be lucky,all depends on who gets your letter, its better getting a few signed on a pic than 1
all depends on who your after
jorgie porter is a hard one to get (1 i deffo want)
wish you luck and if i get my request returned i'll let you know

i sent seperate letters x3(with cast member name/sent 2nd class) it is abit annoying but that way your more likey to get a response,
than sending a letter asking for a list of people
plus some shows for (example bbc) ask that you send seperate letters for each request

my holby city requests took about 9 days to be returned(tina hobley/rosie marcel)
and my eastender took about 12 days to be returned(jamie forman)

those cast cards were hand signed 6x4 photo cards
check my page i put the pictures/envelope on there

oh forgot
i've recently had about 3 cast cards back from,holby city/eastenders in the last week

i recently sent a request to hollyoak's (about 2 weeks ago)for a few of the new cast members
i don't know if they still do cast cards but i have seen them on sold ebay (so i sent a request to them)
if i have any luck i'll let you know