I am looking for about 5 6ft x 2ft wooden trellises.

However, all the trellises I have yet seen of this side have 6 inch
squares. What I want is a trellis with a smaller grid (ie 3" squares).

If you look at the first photo on this page

http://www.woodyalan.co.uk/trellis.html

you'll see just what I mean. The left hand trellis is a 6x2 'standard
pattern' trellis whilst the 3rd from the left is the 6x2 'close
pattern' version.

The only problem is that this guy is in Essex and I don't have
transport.

Does anyone know any London based shops/centers which would sell what
I want?

Thanks for advice.