If you order before 3:00 p.m. weekdays, then your good will go out that day via 1st class Recorded Delivery. It usually takes 1-3 working days for delivery (1st class delivery can ocassionally take up to 10-20 days, very rare but we cannot control Royal Mail).
You can always choose Guaranteed Next Working Day delivery, then you will get your goods the next Working day provided you have placed your order before 3 p.m. You can also select Saturday delivery.
So for example if you place an order on Monday before 3 p.m. and you choose Guaranteed Next Working Day Delivery (for a small charge) then you will get your goods on Tuesday.
If you place it on Friday before 3 p.m. you will get them on Monday. If you place them on Friday after 3 p.m and you choose Guaranteed Next Working day, you will get them on Tuesday. If you choose Saturday delivery as late as 3 p.m. Friday, you will get your order on Saturday.
Please see the Shipping page for more details.