I had given up on this and last night it came to me in a dream. No kidding!
Simple solution really. I just put the full search url in the form plus the added term in the input and it works.
Code:
<form action="http://www.mysite.com/shop/">
<input type="text" name="site_search=red+" />
<input type="submit" value="Search" />
</form>
And a search input for flowers shows results for red flowers.
Only thing is the url is a bit messy looking like this...
Code:
http://www.mysite.com/shop/?site_search%3Dred%2B=flower
but it works.
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