not much more to add here, other than there are some good recipes books you can get which have adapted recipes in. There is one called Healthy gluten free eating which has great recipes in for pizza base and yorkshire puddings.
Sainsbury's free from range is good, especially their English muffins toasted for breakfast. Best bread imo is glutafin select which you can get on prescription. white breads seem to work better than brown for some reason.
Sainsbury's also sell dietary specials gluten free ready made little yorkshire puddings in their freezer section so I always try and keep some in the freezer. They do a brand of pasta called Salute which is among the best I've tried so far.
For gravy granules, all the Bisto Best range in jars are gluten free. Brown sauce is a difficult one, but there are a few on the market, and you can get one brand in Tesco.
Breakfast is always a difficult one; although Sainsbury's and TEsco stock Nature's Path Mesa sunrise flakes which are good and very filling.
Sainsbury's have a few brands of gluten free sausages and their Organic beef burgers are also gluten free. Watch out for things like chips as they are often coated in a thin batter to help crisp them up.
The Coelaic UK product guide also has tips on eating out. When on the road, it might sound odd, but the one place I can usually guarantee a GF meal is McDonalds! Their beef patties and fries are GF...so a big mac meal no bun ticks the boxes. Motorway services are usually a nightmare and the staff pretty clueless unfortunately . He will probalby get very fed up eating baked potatoes with cheese very very quickly!
It is very daunting and I remmeber after my diagnosis three and a half years ago, my first ever GF shop took me about three hours as I avidly read all the labels.
There are some ingredients than can cause confusion as well.....there will be a list on the coeliac UK website I think.
It isn't as bad as it first seems; you just get into the groove with it and it becomes routine. The worst bit is repeatedly having to explain yourself in cafes/pubs/restaurants/to relatives and friends. My MIL still doesn't understand that I can't have a little bit of cake, "just as a wee treat", no matter how many times she is told.
Oh, and lastly M&S do a gluten free chocolate cake that is to die for
Ask away if you need anything else.