Well, you jusdt named bunch of function. I think you should be more focused on your problem: How to create hyperlink from a text
Maybe this?
=HYPERLINK("http://www.caravanclub.co.uk/CaravanClubApps/Applications/UK%20Sites/CalendarResult.aspx?site="&
SUBSTITUTE(A3," ","+")&"&arrivalDate=16/09/2011&departureDate=19/09/2011")
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