I'm glad to see the RSGB has taken up my suggestion and opened a Spectrum Defence Fund to enable radio amateurs to contribute towards a legal challenge to the attitude of the UK authorities over interfering equipment such as power line networking devices. You can contribute by writing a cheque, payable to the 'Spectrum Defence Fund' and sending it to Spectrum Defence, RSGB, 3 Abbey Court, Fraser Road, Priory Business Park, Bedford, MK44 3WH.
I have written to the RSGB strongly urging them to make available a page where online donations can be made. This would allow websites such as this one to further support the cause by writing articles on the subject and publishing links to the donation page. I am sure this would result in donations from a great many people who would not otherwise be aware of the campaign, possibly even from outside the UK.
If you have a website and would be interested to support the RSGB Spectrum Defence Fund in this way, please write to the RSGB as well to support the case for an online donation page.