I managed to just get in under the wire and listen to this broadcast on BBC iplayer before it disappeared and so I'm able to stick my tuppenceworth in.
I was expecting it to be awful from everything that's been written here, but I was pleasantly surprised!
I know Fr. Tim's church well. In fact, because Coventry is so central, the Society's executive committee regularly meets there (and receives wonderful hospitality!). I know that the church has at least two choirs, and I gather that all were invited to be involved in the music making for this Mass. It seems clear from the parish newsletter that Boyce and Stanley were approached by the BBC and then approached St. Thomas More, rather than St. Thomas More being invited to host the broadcast and wheeling in external music directors.
As for the musical choices, I think you've all been a bit harsh! The entrance song reflected the feast and was well known, the Kyrie was fine, with a good cantor. I didn't go a bundle on the Gloria, but it was the words of the prayer. The Sanctus was fine, too. There are so many to choose from and I know several I like more, but Liam Lawton's is not bad. And, again, it used the words of the prayer.
As for the more controversial pieces, I tend to agree with others here. I didn't especially like the offertory song. It had a pop song feel and wasn't my thing but, if you're going to do something non-congregational and different, the offertory is the place to do it, in my view. I didn't like the Agnus Die either, for the all the reasons already expressed on this thread. However, I didn't feel the same loathing for the arrangement of Soul of My Saviour as some of you. It wasn't great, I admit. I'd have preferred it either minus syrupy piano accompaniment, or really funked up, like the version St. Patrick's Gospel Choir sang on the Daily Service that mcb mentioned. This fell between two stools for me, but at least it was something that people could join in with as they processed; I doubt anyone doesn't know the words by heart.
On the whole, leaving aside the Agnus Dei, I think this was good liturgy. Not great musically, but mostly perfectly reasonable. And it sounded as though there was some good congregational singing going on. Lots of young voices were audible too.
As for the cutting of the psalm and second reading, I agree that I'd have preferred that these were included and the offertory song omitted, but that would have been a production decision, completely out of the control of Fr. Tim. And, talking of Fr. Tim, I thought he spoke very well indeed.
A bit more than tuppenceworth!