TUI package - drop the return leg

[fastboysam]

So tempted to book a package with TUI rather than BA as prices are lots cheaper but ideally I'd like to tag on a week or two in Florida after 15 nights in in the Caribbean but wondered what would happen if we were 'no shows' for our return TUI flight. Can't book open-jaw with TUI and the packages are cheap enough for us to ditch the return leg but not sure if they would charge us? Not sure about the different t's and c's with a package charter flight compared to scheduled ones.

Has anybody ever dropped the return leg of a TUI package?

Any advice welcomed. I will call into the shop and ask but would also like any first hand info please.