"Eureka!" An Update.
Thanks to all those who replied here and also thsoe who Pm with ideas on this.
After over a week of searching the internet and local shops for deals on carpet washers I found one!
Not only was I looking for the best price I was also reading reviews to find out which machine would best suit us and our requirements.
Finally I found one that did fit all our requirements.
More improtantly I found a place that delivers for free and includes cleaning solutions in the package with the carpet washer.
My sister and her family has just said yes to coming to stay with us for the new years eve and new years day. They are coming with my niece and my great neice, baby Keira, who has just started to