There are a few spelling mistakes on the auction. You could try copy and pasting your text into word to spell check it, or I think Ebay has a spell checker function in the text editor? Just a small point, sorry if you think it's picking holes.
I'm sure you could get the courier price down. Payperdrop (a courier you book via Ebay) charge £5.99 per item, so two items would only be just under £12. Might attract a bit more interest then?
Possibly offer the option for people to come round and view it before bidding - even if you're not keen on this, it shows that you are genuine and the item really exists.
You don't say that you accept Paypal in your text, but you have offered it as an option below. I would feel happier as a buyer paying for this by Paypal, due to the protection it would offer. Perhaps not so good for you as a seller though if you get someone who claims their money back. The fees will also be quite a bit on £150+.
HTH a bit