<p>Do you have pseudocode for field validation of the following items in the UK? I am from the USA, so I only know the ones in the USA right now.</p>

<ul>
<li>Address Line 1</li>
<li>Phone Number</li>
<li>Mobile Number (in case they have a special rule for this, which they might not)</li>
<li>Post Code</li>
</ul>

Address line 1 could be almost anything. There aren't always house numbers.
Phone numbers: the length of an area code varies. I wouldn't like to swear whether the full length is constant, but I suspect it's always at least 10 digits. Mobile numbers typically (IME) start with 07 whereas landlines typeically start with 01 or 02. Special numbers (free, local rate etc) typically start with 08. I'll try to find a reference for this. (EDIT: Again, there's a good
Wikipedia article
.)
Wikipedia has a
good article about UK postcodes
, including regular expressions for them.