Royal mail recruiting?

ok so i got a phone call today from someone saying that they were recruiting for royal mail. i filled in an application form online about a week and 2 days ago. they said it was just to check my details, straight away i thought it was fraud. but they started asking for me to verify a couple of things such as my name and address but never my bank details, if they had of it would have been the end of the phone call. so anyway the english woman went onto ask me what days and hours suited me to work. after she had asked all the questions she then said we need to verify your pport so next week someone will arrange to come out to your house and have a look at it and to ensure that you are living at this address. this is unusual to me because i have worked as a casual before and last year they just emailed me to come up to the sorting office for an interview, never has anyone said they would be coming out to my house. im abit weary of this as my friend also works for royal mail and hasnt heard of this. he is gonna ask on saturday when he goes in, but i was wondering if anyone could shed some light on this topic please as to me it sounds suspicious. thanks very much