As encouragement, I would say you've got the right ideas with these shots. However, you must get image editing software. Period. Most people here use one of the Photoshop family - its become pretty much the standard software tool to use, which I guess is about as high a recommendation as you can get. The good news is it does not have to be Photoshop or expensive. Try this:
For a freeware picture viewer, cropper, resizer, sharpener, colour adjuster, gamma adjuster etc. Photoshop (Elements or otherwise) it isn't, of course, but it will get you going and teach you the basics and its free. One thing it doesn't do well is rotate - I use the free software that came with one of my cameras or scanner, can't remember which, for rotation jobs.
The other tool I would suggest is something like neatimage:
which removes noise from images - very useful for point-and-shoots which can be more noisy than proper DSLR's and for the British weather, which tends to emphasize any noise in the shots. There is a free demo you can download on the site and you don't need to learn how to use it in detail, just follow the simple instructions and the "Auto" functions. You'll pick more skills up the more you use it. It's such a useful program, you'll probably want to purchase a full license - prices start at £20.
I think a better camera would be a good idea if you can afford one and there is nothing wrong with some of the recent point-and-shoots - just don't expect
to produce Colin K. Work standard images
Look for at least 6 or 7 times optical zoom.
But above all, probably the biggest tip I can give is quite shocking and its one for all newbies (which includes me). Don't take photos of airliners for uploading to airlinersnet. It's what this site is mainly about and as a result, each airliner already has tens, if not hundreds, of shots of it. As the number of shots of an individual aircraft goes up, so does the quality required to get a new shot accepted. In my a.net collection, I've only got a few airliners, most of my shots of them were (and are) rejected. But similar quality (or even lower quality!) shots of military and light aircraft made it in, no problems. Its all about how common shots of an individual aircraft are and you'll find it tough to compete in the airliner field without better processing or camera these days. Not impossible, but tough and nothing will kill your enthusiasm more than a constant string of rejections. At this stage in your hobby you need to be building up your basic skills, especially post-processing and possibly thinking of a better camera (but not necessarily). I recommend you do this at your local general aviation field, there should be several within reach of London. Take your A330 (just bought one for my mother funnily enough). Get as close as you can, take static shots of light aircraft and biz-jets that you see. Maybe take a walk around the perimeter to near the runway threshold for more interesting landing shots. Light aircraft don't very often produce photos that score big hits, but that does not mean the shots are bad. Practice your editing and you'll improve. No airshows left this year unfortunately, but they are good places too as you can get close to aircraft in the static display and they are popular with the viewers. Then when you are ready, go back to Heathrow for the airliners with your improved skills, tools, weather and possibly camera. You'll still get rejections, but I'll bet you get some acceptances too.
The very first photo I uploaded to a.net was accepted, about 5 months ago now. It's nothing special, but it illustrates the basic guidelines I've given for newbies very well - it was also the first shot of this aircraft on airlinersnet. Taken with a 3MP Fuji S602:
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Photo © Jim Groom
and here is one taken with a 2MP Olympus:
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Photo © Jim Groom
so it can be done.
Don't give up, best of luck and enjoy yourself (even if the shots don't get accepted)! In 6 months from now you'll look back and see how much you've improved.