2 types of shipping to same country

Hi,
Ive had a look through the forums but cant seem to find a solution although I have seen others with the same issue.
Im using Zencart 1.5
I currently have a table set up with 3 price ranges £0-50 is £5 shipping £51-100 is £10 shipping £100+ is free shipping.
My checkout is based on value and this works exactly as expected
What Id like is for a customer to be able to, at checkout, chose standard shipping or courier shipping which Id have another table for but higher shipping prices.
So my question is, in a perfect world Id have 2 shipping tables one for courier and one for regular mail and the customer will click which they want.
Can this be done ? is it something to do with zones ?
there is no international shipping involved all items are just to be shipped to the uk from the uk

Thanks
Joel

http://www.zen-cart.com/forum/showthread.php?t=41751

Thank you. I have it kind of working. I can see both tables now and they are displaying correctly depending on the price. However when I pick from the second courier table my step 2 always displays the domestic post rate not the chosen courier rate even though the radio button toggles correctly between the 2 post methods

Just an observation...
I think its always choosing the cheapest way instead of the chosen way, so perhaps what needs to be done is to remove that default. Is there a flag somewhere that I should be setting to false?