it was a small item and it worked out at £3 and only cost me 80p
You will have to determine the costs you require but I will try to outline what needs done for the "table rate" shipping module
Table
Code:
1:0.50,5:0.75,10:1.5,15:2.5,20:4.75
Table Method
weight
Handling Fee
Average cost for packaging
£0.25
So to capture shipping for what you stated and I am guessing your costs
Small item 1 ordered and you need £0.75 to ship 1 and it weighs 1 weight unit - - - this includes packaging
From table a weight of 1 will be £0.5 + handling fee of £0.25
small item X 5
From table - 5 units is £0.75 + £0.25 handling fee
For your special item that I take it you have due to how you initially set this up you can give it a weight of say 20 and you want to charge £5.00 to ship it
From table
20 weight units is £4.75 + £0.25 handling fee
You can expand table as you require and alter cost per unit of weight, change product weights to what is required to ship etc