Feel free to direct message me with any Grässlin timer issues, you could opt for a Grässlin replacement, the feeling D101 would have worked https://grasslintimer.co.uk/product/grasslin-feeling-d101-rf/
Hi,
Just realised how old this thread is but for anyone else looking....
I was struggling to find boiler cover for my pulsacoil, but i finally found these guys https://homerepairs.group/pulsacoil-boiler-cover/
I hope this helps.