LGW is not at all obvious to me. Getting slots there is possible, but at the times you would need to make this service viable? No chance - your times, CWL_P are peak at LGW. In any case, given that a large number of potential passengers on this route will be the bucket and spade brigade, will they want to add another £75 to their tickets? What if AW goes tech, gets delayed? They miss their flight, with no comeback on AW (which is a point to point carrier, no interline agreements in place).
As for BRU, you have missed the "dead sector" problem. BRU-CWL-BRU will be very lightly loaded, and this affects the economics of the route badly. The suggested flight times would also play hell with the existing schedules....
As for routes from PLH - look guys, PLH is short, narrow and nasty. There are very few routes you can do out of PLH with anything like a sensible load, and between 6G and WOW, they are virtually all covered. If you want to see more interesting routes, try EXT!
SNN from CWL? Nah.... you ever BEEN to SNN?