Hi that is a really good idea for your garden.
I forgot to say this is my backgarden and I also uploaded the wrong image I have this large ugly oil tank and boiler and was wondering if you have any idea's about concealing it.

You could try a lattice fence (easy to build rather cheaply if you are handy with a hammer) and grow some clematis or other vine on it.

I like the cottage look to your garden do you think it could work with a bit of a larger paved space enough room for a table and a few chairs?

Absolutely! In fact I wish I had somewhere for a small bench in my yard so I could sit there and take it all in (glass of wine in hand!)

I was also thinking about some sort of climbing plant for the large bare wall that surround the yard at the moment.

Clematis, Trumpet vine, bittersweet, climbing roses come to mind, depending on the light it gets.

Also I have a narrow walk way at the side of my house that has a high wall running down the entire length do you have any idea's about making this walkway look alittle less boring.

Depending on the light, I think a row of various container plants? Hard to visualize. I've always wanted to try my hand at epalier (sp?) - the art of growing a tree flat against a fence - but I don't have anywhere to do it.

What do you think about having raised boxes in such a small garden do you think they are a good idea?

My DH built me one on my patio - I love it! But I also bring out plenty of potted plants/trees for the summer to fill in. I'll try to upload a picture...

I colour coded this picture so you can clearly see the soil and the house apart was kinda hard to see with the line drawing.