Not sure if this is the right place to post this, but here we go! We have a dog cage available. It is collapsible, very good condition (just a tad dusty!), rarely used, doors on front and side. I'm not sure of the exact dimensions, but easily fits the tallest of springers. The chap who had it originally used to keep his German Shepherd dog in it.
If any of the rescues could use this, they can have it with pleasure (but will need to be collected, or within a reasonable distance for me to drop off from Cambridge)
If anyone else is interested, it's yours for a small donation to one of the rescues!
Thanks, everyone