An update for the benefit of all those who were kind enough to help me get my zgemma H2S up and running using Wooshbuild after the initial OpenATV on it failed to boot and the OpenVix software subsequently supplied by the seller had some problems including crashes.
I was initially unable to download the Wooshbuild plug-ins, as the site was down. Then I found that the download was stalling halfway (twice).
I finally suspected that my tiny new USB wifi dongle adapter (Tontec 150Mbps 11n USB Wifi Dongle Adapter for Raspberry Pi/Windows /Mac OS) was not strong enough to pick up the signal from the router, two rooms away, and eventually moved my tv and box next to my router and used ethernet. This downloaded quickly, and the rest of the installation sufficient to watch the programmes went very smoothly.
I thought that the Wooshbuild installation instructions were very good indeed (almost detailed enough for a novice, with only one or two steps not totally clear), and do not intend to move away from Wooshbuild unless some serious problem occurs with their version builds.
The recording of a programme yesterday went very smoothly, and so silently that I doubted it was happening. My recording HDD is a Hitachi 500GB 2.5" (£38.48 from Valar via Amazon UK) in an eBay external enclosure which was stunningly cheap at only £3.60 delivered. It runs off the box's power through the USB, but has an extra USB lead for those who have to use 2 x USB sockets to get enough power (such as if a 3.5" drive was used). Sources of these devices were: Enclosure: eBay Item ID: 172141759384 ; HDD: Hitachi (HGST) 500gb 500 GB 2.5 Inch 5400 RPM Sata Hard Drive Thin 7MM For Laptop/PS3/Mac - 3 Years Warranty.
Once again, THANK YOU!