Hi Guys,
Thanks for all the advice provided. Basically the mature trees line a road running from north to south along the eastern edge of the site. The treeline is the boundary of an old garden and to the best of my knowledge the soil is fairly neutral, however in all honesty I'm not sure about this.
The site itself is in an urban area in Bradford. I have attached a picture of the treeline I am talking about. It is the treeline to the left of the image.
Thanks again,