Eh? NO. Once its in the royal mail system you'll be lucky if it's ever seen again! You might get it by Saturday, but are you sure the company uses royal mail? If they use a courier you might be lucky and get it tomorrow.
If it was posted first class today, you'll probably get it saturday.
If you phoned up and asked them to find it for you so you could pick it up they'd laugh at you (not literally but I'm sure you know what I mean).
hope it arrives on time for you
EDIT: yeah, you're hopeless with details! You'll be very lucky if it arrives on Sat. I'd say monday to be honest.
If you can get a phone number for the place call them first thing in the morning (before they dispatch it) and ask them if they can do guaranteed next day delivery for the Sat, might cost you a few quid but at least you'll get it on time.
If it was posted first class today, you'll probably get it saturday.
If you phoned up and asked them to find it for you so you could pick it up they'd laugh at you (not literally but I'm sure you know what I mean).
hope it arrives on time for you
EDIT: yeah, you're hopeless with details! You'll be very lucky if it arrives on Sat. I'd say monday to be honest.
If you can get a phone number for the place call them first thing in the morning (before they dispatch it) and ask them if they can do guaranteed next day delivery for the Sat, might cost you a few quid but at least you'll get it on time.