I would once again like to thank everyone who has contributed to this thread. I have eventually gone with the Fein model herehttps://www.axminstertools.com/fein-dustex-25l-wet-and-dry-extractor-230v-506260
By the time I bought the tools and a couple of extra bags it is about as much as I can spend. No doubt there will be something out there that is better.
There are some terrific choices when one starts to look into it, so asking on here has been a great eye opener. Thank you all!