Hi Scott,
Having looked a bit through your Flickr and homepage, I'll have to concur with others being critical. You'll need to improve the home page, others have already posted a lot of things that could be done.
Now, that being said, I'm definitely not a professional - but do design lenses as my day job so I'll have to keep myself informed how people are actually using the objectives. However, I do note that I could've done better some of the things, while some of the others not which is not something I like if I'm contacting a pro. So, instead of thinking being surrounded by amateurs, you'll need to ask what could you do to push yourself above the amateur level.
From the Flickr it looks like you're at your best at photographing mechanical stuff, airplanes and so on - though cars do need a bit more practise (I find them difficult to photograph). I personally liked the air show photos where planes are in the air against colorful sunsets, but planes on the ground not as much. Take a look on the posted Snappy vs. Crappy page (great find whoever did that!), where a photographer has found his niche in mining industry. His work clearly stands out from the rest.
So I'd advice to develop your strongest area in a public way, but keep the areas where you need practise out of the page. This pretty much mirrors what others have said.
Also, avoid mixing OK pictures with great pictures, like some of the airplanes taxing on overcast day with those colorful and dynamic airshow photos. Overcast weather makes it darn difficult to shoot in natural light, so until you get really (and I mean REALLY) good at it, try to keep them away from the portfolio. Or just start controlling the light at overcast days, but that's something you just can't do with airport photos. I find that unless I can find a good subject, a photo taken in overcast day is a photo that I could probably do better on some other day and look to do that then. As somebody else said, less is better in this case.
On the other hand, shooting airplanes on a clear day can be equally difficult if there isn't a distinct subject.
This ejection photo is an example of a more direct sunlight photo but the pilot ejection itself makes it more interesting.
A bit of criticism towards the family photos, I find taking group shots of standing people tends to lead into a mediocre photo, especially if the camera is facing directly the people. This is an area where I think you need to improve if you'd like to advertise families on your page. Family to me is a much more intricate matter, and it's more about those private (not THAT kind of private) moments together.
You may see what I mean from
Elena Shumilova's work, a Russian mother who mainly photographs her family. She's probably one of the most talented non-professionals (as far as I know, it's nothing short of amazing that she isn't a pro already) I've ever seen. There's a bit of animals there too. She mainly uses natural light and has been educated as a painter. Though, taking these sort of pictures at occasions like birthdays would be extremely difficult. That's when knowing the local weather and how it works in the pictures helps!
For model shots,
Katerina Plotnikova is a source of inspiration. Don't worry, when it says "Adult content", it just means model's skin is visible, but she succeeds walking a very thin line on not being offensive of any way. Those beds in the trees are NOT photoshopped, but really there. Don't ask me what sort of persuasion skills she has to have to get the model to agree to go there, or dance with a bear! She occasionally does explain how the shots were taken.
I think some of your architectural shots would need to be improved, but this is an area I don't know much about. Ultrawide perspective does make buildings look funny, and while OK with friends, I think it's not something that professional can afford to do too often. Perhaps tilt/shift could help here?
Landscapes with ultra-wides is a different subject entirely. I don't find doing that very easy, and it often requires me to switch from ultra-wide to just wide to get rid of the perspective distortion. Also I need to know at what times and where the light becomes good, so on weather forecasts, I'm looking for sunny days today and rainy days tomorrow. That often means that the extra humidity may turn the evening sky red, and at that time I want to be somewhere photogenic. That may not be your area, though. Additionally, shooting landscapes tend to force me to go there very early or very late with the additional challenge that this city is very flat, leading to little depth in the images.
Just some commentary from me, tried to be constructive
. But far too many of over processed planes, I realise Flickr is just a general gallery but still! Your night shots of Glasgow riverside are good but still the general vibe I get is amature work. 
