Problems with accessing the RSPB website

Yesterday Sunday and just a few minutes ago I’ve been getting when trying to access the RSPB website on different browsers using my iPad it says This Service is Unavailable. I’ve tried rebooting my iPad, rebooting my Router and clearing my Cache and History to no avail. The only way I have been able to access the RSPB website is by googling, but not by using my favourites or typing out the website address. The forum seems unafected. Has anyone else had these problems, at least using an Apple iPad?