My keyboard broke, I didn't have a way to come and reply to any of this! Now I'm in editing mode so I have a few minutes, may not be able to respond fully to everyone, will try though....
Rich, will check out those links, thank you! Good ideas re. indoor environments!
thanks Donki!
Tim, thanks for that explanation, helps a lot with my understanding of flash. Once I'm less busy, will have a play. Will do print outs of all this good advice on here, and when I'm on hols in Mexico in TWO WEEKS (whoop!) I can try out the advice indoors - in the restaurant/hotel room at night... also thanks for the comparison shots, really very helpful

The shot of the little boy on his Dad's shoulder is really nice, and plenty sharp. And the sparkler pictures are great, really telling about what flash can do!
Tracer, I actually do have a little pull out bounce card built into my flash - not sure how good it is or isn't - must experiment. There's also a pull-out diffusor which I think I had on.
Jabbermack - there is no doubt about it, I want better glass, for a start, I'd love a 70-200 Canon lens. But as Rich said, it's not on the cards right now. Can't even afford to replace our rotting window frames - eek. Need to either get a job with more than 10 hours a week or I need to start commercialising my photography.
TommyH, what are hassleblads? I'm intrigued! Empty church, fab idea! I think you're a genius!
Paul, thank you - that's good to hear.
Chappers thanks so much, will try that and stick with LR
Hoppy, yes the groom is about 7 feet tall, the best man (his brother) about 8 feet tall, and the bride about 5 feet tall! I could have put her on a stool or taken the men down a step, but then that would give an unrealistic picture I think
On that note, Ed Bray, I know it's a massive no no - as I was saying earlier, this was impossible as I was back as far as possible, but yes I should have moved closer in. I would not normally chop off feet. I'll be cropping to correct for that.
tijuana taxi that is so kind! Unfortunately I'm in the north of Scotland. Living where I do and I miss out, again

Mind you it's "affa bonny" where I live so mustn't grumble.
Hoppy and Tim - the answer to the lighting question: my new flashgun (a Yongnuo YN465) which was mounted on the camera, and there was a window directly behind me, but with not much light as it was on the shaded side of the building, sadly.
thanks Richard King - I agree the location has major issues. Thanks for the tips. I was under the understanding that the location was the beach (reception venue on the beach), but this all changed on the day. The weather running up to the wedding had been awful and they were worried it would rain during group shots.
Hope I remembered everyone!