What’s the most common service in the post service?

W: Surely the number of letters posted nowadays has dropped because of the telephone?
M: Not a bit. Millions of letters and parcels are posted every working day.
W: I suppose most of the items are sent by the ordinary letter and parcel service.
M: Yes. They’re usually fine for everyday needs. But they’re not designed as compensation services.
W: What do you mean?
M: Well, you can’t receive any money from us if the item you’ve sent gets lost. We do pay some compensation.. . up to a maximum of ￡16.50 in fact, if it can be shown that the letter or a parcel was lost or damaged in the post.
W: That could be difficult to prove.
M: That’s why it’s better to ask the counter clerk for a certificate of posting which you’ll be asked to produce if the article does get lost.
W: Do you have other special services?
M: Yes, indeed. For sending money, or any other articles of special value you can use Registered Letter Post... or if you want to send a valuable article by parcel post, you can use the Compensation Fee Parcel Post.
W: I hadn’t realized that all these services were available.