Magazine subscriptions a treasure trove of personal data

Just got one of those magazine subscription leaflets fall out of my paper, nothing new there. What was surprising was that their freepost piece of card asked for so much personal information, which would then be all plane to read as it made it through the postal system:

Name, Address, Daytime Tel, Mobile (aren't they the same?), email, year of birth, bank account, branch, signature.

If you must take up one of these offers, send it back in a brown envelope!