Scrap this national final format, sack the entire delegation, and start afresh. We need to think completely differently about everything.
In every group project there's that one person who will do absolutely nothing, expect full credit and then whine when things go wrong. Usually, this person is also ridiculously entitled and spoiled. This is the UK in Eurovision. It doesn't take a genius to realise that we richly deserve every terrible result we've had for the last 15 years, and that we're only going to get more of the same by sending middle of the road pop trash sung by hopeless nobodies. The only way out is to extract ourselves from our own backsides. We have one of the best music industries in the world and it's time we actually started using it.
Also, get OGAE UK as far away from the national selection process as physically possible. Better still, let's disband it entirely.