partial resident of uk? 183 day rule?

In order to be considered a resident for only half a year (partial) you have to be in the uk for less than 183 days.  Now I was in the uk as a tourist then came back into the uk on a visa.  Do they count all the days or just the days since I arrived on the visa?

I did not work in US for the year 2006 and began working under my visa in the uk in october 2006. 

when you arrived on a visa. The days you were here as a tourist,doesnt count

So if I am here less than 183 days what do I do?  and what am I entitled to?
I was under the impression I was entitled to a tax refund of some sort.

Elizabeth 1969 -

You may be able to file as a nonresident.  You are taxed only on your income from the UK, not from outside the UK.  The other options are to file as a UK resident or a UK split-year resident. 

To determine the actual options would require much more information than can be handled in a simple forum.  You can call HMRC directly (anonymously, of course!!!!) and read their information pages on residency and nonresidency.  Once you understand the background material a bit better, if you are still uncertain, you can then call an accountant and discuss the case over the phone. 

Putting things in writing before you understand the consequences is a bad idea - verbal is safer.

PS - while you're in the UK, it's Al-You-Mini-Um