So guys I went out tonight armed with your tips and the result was 8 fish in just over 2 hours.
4 Bream
4 Whiting
I think it was a combination of everyone's advice that did it. I used a 9lb line and a very small sinker, might even go lighter next time.
I used scottyB's and fishingphase's casting and striking techniques. Bait presentation was as the incredible hull said. Peeled prawn along the curve and the shaft of the hook with the point completely exposed. I casted out and let the sinker sink. Once it sank, i slowly pulled the line bobbing it every now and then. When I felt a nibble I just jerked the tip of the rod a little and voila! I actually caught a Bream with my first cast but it got away just as I was pulling it out of the water.
After a quiet 20 minutes, I was slowly pulling the line in when I felt a big nibble, I jerked the line and out came a 27cm Bream at the end of it. It was a gut hook-up.
This was a great improvement on my previous trip and I learnt a lot from experimenting with different casting/striking techniques. I'm a beginner so the advice from everyone that posted was very very helpful to me.
Best hook, from my selection above, turned out to be the long bait holder (2nd from the left in the picture in my first post). I'll be buying a packed of those in a bigger size tomorrow. Mustad long bait holder.
Photo of the 27cm bream is attached below.