i have the zone table rate modulal instaled and working great for uk postage for mainland, local and highlands etc

but i am expanding my business over seas to irland but on a smallers scale as my larger items are not able to be posted to irland, how ever smaller items are.

all my postage is filtered by weight, is there a way in which i can set for irland with weight over 100 t will show this item can't be posted or make it so item wont allow checkout or something, but anything under 100 is fine and displays the postage cost set by the rate is 99:14.50 etc

any ideas or help will be great