I agree with JohnWash, Dockerills, your auctions already look fine, but I looked at your HTML and this is why I think you'd be much better off getting somebody to design you the auction using CSS (presuming you are planning on changing them all, personally as I've said, they look fine, and I really doubt it will sway anybody to NOT buy from you, if you leave the auctions as they are) - this is the first line of your auction:
<p align="center"> </p><blockquote><font face="Times New Roman"><font face="Times New Roman"><font face="Times New Roman"><font face="Times New Roman"><font color="#ff0000"><p align="center"><strong><font face="Arial" size="3" color="#333333"></font></strong></p><p align="center"><strong><font face="Arial" size="3" color="#333333"></font></strong></p><table border="4" cellspacing="10" cellpadding="5" width="660" class="form_small" align="center" style="background-color: #fefefe; border: #568a69 4px solid"><tbody><tr><td align="center" valign="middle"><p> <u><font size="5"><font color="#000000"><strong>Pz. Kw. VI Tiger Tank - Vintage 60's/70's Kit</strong><em>.</em></font></font></u></p><p><strong><u><font size="4" color="#000000">AIRFIX TYPE 3 BAG, 1/72 SCALE MODEL (c. 1963-73).
99% of that HTML is unnecessary - look at the number of times it says <font face="Times New Roman"> at the start, and then it says <font face="Arial" size="3"> thus negating the previous <font> tags.
You could just have
<h1>Pz. Kw. VI Tiger Tank - Vintage 60's/70's Kit</h1>
<h2>AIRFIX TYPE 3 BAG, 1/72 SCALE MODEL (c. 1963-73).</h2>
<p>Auction description</p>
and then some CSS which you never need to change, to go with it.
I'm sure you can learn the basics of CSS if you've been able to change all that HTML code, as you clearly have done, in the second link in #45.
But really I would leave your auctions exactly as they are, they looked completely fine to me, that's why I originally asked you if you could show me some of your auctions that had problems, because the ones I looked at were all perfectly fine as far as I can see.
edit:
I've just had an even longer look at your vintage toy auctions, and I think they look fantastic - the most important thing is the quality of the photos, and yours are excellent, and the description looks neat and tidy, and is clear and easy to read. So I say leave them as they are, they look great.