Ta. I think the heated screen IS working...though I thought it wasn't.
Hard to explain but basically the new screen is more subtle, no obvious lines of melted ice like the old one, and indeed, the elements are very hard to see compared to the old which were very obvious.
The new screen clears slower with no melt lines and is just not as good as the old which I think was the reason why I thought it wasn't working. I apologise for being a mong.
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Another plus is I've found a guy selling the paper version of the workshop and electrical manuals around an hour or so from me for £30 so hopefully fetching them in a few days, already in poly pockets and ring binders too.