Sorry to contradict you but in Gran Canaria a good quality 80cm dish with Inverto Black Ultra reliably picks up E28A Fixed. I have this configuration in my rental villa.
Well this actually happened by accident. The specs for E28A show a 1m dish but my installer used an 80. At that time I did not have any knowledge and thought it was odd there was channel breakup on the fixed beam. I changed the LNB for an Invacom that we decommissioned at home but not much difference. A few months ago I ordered the Black Ultra (which by the way feeds a multi-switch) and all the problems went away.
We have no PSB channels in that house (obviously) and I am waiting for 2F to go live before deciding what to do next. Options are -
1. Put in a dish big enough for 2F UK spot (couldn't go bigger than a 1.8m though and not sure if the cost is worth it, but it would feed all five receivers and get the most channel derivatives)
2. Put in a separate receiver and dish for Intelsat 907 (Channel 5 HD comes in from 28.2E)
3. Make do with catch up services via Sky On-Demand and UK VPN (which I will be setting up anyway this week)
Boringly, I think option 3 might win on cost grounds. It is a good compromise.