Just to add to that, be aware that there is also some vocabulary for each edition published on the website. Go here:
then click on the “Geirfa’r Podlediad” tab, which should take you here:
http://www.bbc.co.uk/blogs/radiocymru/authors/d7e8c1da-d12b-3421-a95e-2ab4c9f7623d
(I say this because they are fairly easy to miss unless you know to look for them).
Perhaps suggest to him that if he’d like to save money they could be printed in Welsh only…? 
Wow @Mihil and @mikeellwood. Thanks for all those helpful tips. I am already doing some of them (the radio Cymru, reading signs and Welsh language events) but have not done them all. Funnily enough, when I did French GCSE I put post-its all around the house but didn’t think to try that this time! I so need to check out the Pigion podcast, that sounds perfect, especially with the vocab help. Will definitely be using your advice going forward in my hopefully new bilingual life!
Pob lwc Ceri, and don’t forget to have fun with it. 