Standard Mattress & Bed Base Delivery with AO: You can reach their dedicated support team on 0345 604 2352. 

Their opening hours are:

Monday to Saturday 9am-6pm

Sunday 9am-6pm

DPD: Accessory only orders and toppers are delivered via DPD. Once your order has been shipped to DPD they will email and text you inflight options. You will then be able to make changes such as changing the delivery date, request to leave parcel in a safe place and deliver to a DPD pick up shop.