Hi,
Well....I added code and cleaned the syntax to compliment what I see (or don't see) to complete what's in the paragraph wrapper including that text and closure tags for the anchor, font, and U/underline. There is some incomplete/broken code there too, that I removed. It followed the ?/query string on the URL, which I don't think is needed for a store link. Try this.
<p style="TEXT-ALIGN: centre"><u><font color="#0000ff"><a href="http://stores.ebay.co.uk/OLD-CAR-MAGAZINES-and-BROCHURES">Visit my eBay Store</a></font></u></p><pre class=standard1 style="MARGIN-BOTTOM: 0px; WORD-WRAP: break-word"> </pre><p> </p>
Danno