Well this is weird. I've upgraded my computer with an SSD and took the opportunity to install the latest version of Linux Mint (18), as I was on 17.1 before, and BOINC updated to 7.6.31 from 7.2.42. I wasn't expecting it to make any difference to Rad at home tasks, as they don't use much cpu/disk anyway, but now I've got it up and running, I'm seeing all my tasks end in about the same elapsed time as before, cpu time is similar, but I only get half as many credits per task!
Just wondered if anyone else has seen this before or know why? I could boot up under the old OS for a while I suppose and see if it goes back to normal credits per task. I'll run a few tasks for other projects as well first and see how they get on too.

You need to set your sensor location on the map again :)

Edit/explanation: It's effectively a new host, so needs the location to be set, just as if you'd added a new host.
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A-ha, that's fixed it, thank you Al! :-)