The first thing to do with any ZC store that is going to be used in the UK is to go to this file
includes/languages/english.php
and change the TEXT_PRODUCT_WEIGHT_UNIT and TEXT_SHIPPING_WEIGHT from lbs to Kg and magically all the weights in the shop are now displayed in kilograms. So you do have to edit a file but it's not that bad.
Next in Admin go to
Configuration > Shipping/Packaging and then
Package Tare Small to Medium which you change to
10%:0 and
Larger packages - added packaging percentage:weight which is changed to
8%:0. Now what this does is change the packing material weight from the default USA rate which is to add 3lbs (and would add 3Kg to a UK shop) to adding 10% and 8% weight, you may have to tune this later based on your goods, but it works for the majority of people.
The 3:8.50,7:10.50,99:20.00 that you quote, is the same type of thing for every postal modules. It's the same format for every rate which is
MAX_WEIGHT

RICE,MAX_WEIGHT

RICE,MAX_WEIGHT

RICE,....
so in the above example you have everything weighing to 3 Kg costs £8.50 everything to 7 Kg costs £10.50 and everything to 99Kg costs £20.00.
Now the uk courier modules can come into effect for items larger that the royal mail will ship (which is 20Kg for Standard Parcels but a measly 2Kg for Airmail) but if you want to specify a maximum shipping weight, the you co back to configuration in Admin, click on shipping packaging and click o
Enter the Maximum Package Weight you will ship and put in 20Kg. This is a bad title for the option because it means that if the weight is bigger than 20Kg, it will split the package into smaller boxes. It's not a perfect system as it's very much built into zencart so if you have an order that weighs 23 Kg, it will split the price into two 11.5 Kg packages. This is "okay" in the sense that you would not undercharge for shipping as 2x 11.5 Kg packages costs more than one 20Kg package and one 3 Kg box, but there are cases where objects cannot be split into 2 boxes and there is no facility inside zencart to do that.
If you want to ship more than 2Kg abroad then the best setting is to put the maximum shipping weight down to 2Kg and standard parcels will still give a quote as I've overridden the Zen cart settings and now I'm going to have a look and see which other modules I did the override for, because I've forgotten. That should at least answer some of your questions and you should have a working shop quoting for posting as soon as you've changed those settings
Philip.
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