If you are not already aware, today (Wednesday 8th July) marks the beginning of a three day strike by Royal Mail employees in London. Please bear this in mind when sending books either in or out of London. You may wish to inform any buyers that could be affected about the possible delay of their parcel or offer an alternative form of delivery.
If you do wish to offer an alternative delivery service at a more expensive price, remember that you can request extra charges from buyers. This would provide them with the option of a faster, guaranteed service and you can explain why you are offering this option in the Comment box. If the buyer refuses, you can still process the order at the normal price and send it by standard post.