Hi Simon. I have had a quick look at your website and I would give you the following feedback.
On the 'about' page I wouldn't start my pitch with the word "although" because, unconsciously, it is a negative word. If my focus is to do portraits (and the rest of your site is geared towards that after all) I wouldn't worry about letting people know my other interests. I would emphasise my fantasticness at portraits and leave it at that.
I am torn about your "...in touch and arrange your session" phrase. I can see where you are coming from, but I wonder if " and discuss what you want/need/would like" would be more tempting. I worry that if I ring you are you going to make me arrange a session; when I would want to see if I like/trust you first. Can I only get in touch when I am ready to arrange the session?
Pricing guide: You might want to change the punctuation here and shift it around a bit: I would have it this way if it was me.
Gift Vouchers for £25, £50 & £100 are available and make ideal gifts for mums, dads and parents to be. (at the very least I would take out the ' where they don't belong)
The main thing that I would change would be some of the pictures on the gallery. I would find a female friend or two and ask them to look through any images I have and give them an "ahhhhh! score". They wouldn't have to comment on whether they 'like' the picture or not, or whether they think it is a 'good' picture or not - just if their first thought is "Ahhhhh". Anything less than a 7 or 8 on the ahhh scale isn't going to tempt others to give you a call - and too many non-ahhhh pictures will outweigh the ones you do have. Get the ones together that have the highest ahh-factor and use only those ones. You might love the rest, and see why they are better pics - but you're not the one you have to convince.
Personally, I think that a lot of portraits that are ahhhh for the parents, because they capture the child's unique character, just aren't that interesting to others - the parents will love them but strangers will probably think OMG.
For me pictures 2, 9, 12, 14, 18 and 20 would have an ahhhh-factor of 7 or less. So, overall they detracted from my feel-good-factor about your site and I would probably have moved on.
I like the simplicity of your site and found it easy to get around. If I could get someone to take a pic of me during a 'shoot' to help prospective clients to feel more of a connection to me then I would think about it.
Good luck with the new business - sometimes these things just take time.