If you order a phone or tablet before 5pm Monday-Thursday, you'll get FREE next day delivery from the DPD (UK) express parcel delivery service where possible.
If you order after 5pm, DPD will process your delivery the next working day. So if you order after 5pm on Friday it'll be processed on Monday and you'll receive it on Tuesday.
All SIM only or Data SIM orders will be delivered by Royal Mail and usually arrive within 2-3 business days.