I'm having a small problem with a new site and shipping rates.

The new site will carry a variety of different goods and some will be light and some will be heavy but it will only ship within the UK.

I looked at the Big Royal Mail and installed it but i'm not sure it can do what i need.

I was wanting to be able to set a postal price which is accurate but need one where i can also add an extra amount on if the customer should order more than one item.

For example. Lets say someone bought a shirt and postage was £2.45 recorded delivery. If they put two or three in their basket it might cost an additional £1 to deliver and i was wanting to be able to have something which would allow me to list the postage as being a £1 higher.

Has anyone used this module ?

http://dev.ceon.net/web/zen-cart/advshipper/features

Is it any good and would it give me anything which i couldn't achieve with free modules ?

I'm actually finding the shipping section hard to deal with as before i just used to set a flat rate.

Now i find it much more complicated and i am not sure how to configure it all. I really need help.

If anyone can advise i would be grateful.