Thanks for looking into that for me. It would have been so simple for me to actually do that myself before posting, wouldn't it?! Let my excuse be that I've been away from FH for a while and have obviously forgotten how to be thorough on my own behalf.
I've now tried some searches using just surnames, to be listed by year, and found the dates to be quite extensive, but only for a few parishes - seems to be mostly northern, particularly for births and marriages. Some that I'd previously found through browsing don't come up in searches. There are very few from Douglas/Braddan/Onchan (so far?) - my own & my parents birth & marriage aren't there yet. Presumably it's all still a work in progress.
Thanks again.
Sylvia