
How weird, I've been looking for these myself this week as I have loads too :-)
So far I've just made some crumbles to freeze, thanks to youtube I am using the 6-3-3 squad formation :-P which means 6 units plain flour, 3 units sugar, 3 units butter. Thanks to a friend of mine who is an amazing cook, I'm also using demerera sugar and Trex butter, she assures me these are the very best choices for crumble.
For the raspberries I just squish them into the tray (I'm using those foil trays with lids for the freezing, Morrisons do decent big pie ones) to about 1/2 or 3/4 up the side, then chuck some sugar on to sweeten them a bit as mine were getting a bit tart having been picked up to a week before I used them, and then poured the crumble on top.
I've not tested it yet - I made a dinky crumble for testing, which I'll be eating today :-P - but it certainly looks nice!