I have had a quick glance so here goes.
1. A professional selling shop shouldn't have Adsense on it. EITHER it earns moeny from adsense, or it sells products. As for the sponsored ads in the footer, well that is so sad. You are selling OAK products, oak is seen as solid and dependable, yet you have made your site flakey by having google ads and a lousy Google search box on it.
2. Why is the top paragraph aligned centre?
3. Why have you underlined headings when they are not links? If you underline text, it should be a link (this is just standard net practice)
4. You have WAY WAY WAY too much information on your front page, little wonder people are leaving. The front page is a welcome page it should invite people into your site . If you are going to list stuff as you have, then the text shouldn't tell them anything really, it should be there to encourage a click into your site.
5. Get rid of the first heading 'welcome to the oak shop' it isn't needed and spoils the flow, they are past your header area and into the body copy.
6. Make image links meanigful. I clicked on the image of the oak winerack on the front page, expecting to see a larger image, and what do I see? I see a 3' oak sideboard and some other stuff in your shop. That is lousy and would have seen me leave the site.
7. Image quality is poor, the images don't show close ups of the goods, you are going to struggle to sell items with those images. As already stated, most household purchases are solo researched, yet jointly decided. Having a print friendly site is crucial.
8. The 5* holiday thing is the final nail in your coffin. If my wife wanted to have breast enhancement surgery, I might consier 'Dr Jones Plastic surgeon', but Dr Jones Plastic Surgeon and Drains unblocked' is an absolute no no.
I could go on and on, but you really didn't ask for a website review, and this thread has turned into one.
So back on track... IMO to slow down bounce rates, you need to have your front page enticing people to click on stuff that takes them into your site. So the sections you have, have as obvious clickable links, and have a page for each section. Cut down the text to something like
We sell oak furniture, and here are our most commonly asked questions, and here are our products.
BIG PICTURES!!! You are not selling £5 impulse buy items.