I Am a Unicorn

A colorful woman named Evelyn, who recently arrived in London, is pulled into a house of black-dressed mourning women who are about to leave for a funeral. She's not supposed to be there, in fact we have no idea where she was supposed to be but she's now surrounded by these women who think she is someone named Daisy, the niece of the one who has died. She goes along with it as she is given wine and cake, then is persuaded to do her impression of a giraffe. She's enjoying the hospitality until the real Daisy arrives.

That's all I'll say about it as I don't want to ruin the ending. Its all played very charming and is worth the watch if you can find it.