As far as i know, trilogos come with 3 main bubbles types. The usual/"normal", crush-prone, sharp cornered [at the seal] and divot/dimple cornered [at the front corners of the bubble] which appears to be the one you have here.
The 2nd you get the same bubbles but without divots/dimples at the corners. (i don't know the reason or history to these two differences)
The 3rd most common [and as far as i know only other variation] of tri bubble are the regular kenner style, round lipped bubbles which come with or without stems [just as they do on earlier kenner and palitoy mocs]. These are slightly more sought after and slightly more valuable but still quite common.
All bubbles vary greatly in size and depth depending on the figure, just as all bubbles do.
It appears to me that you have a 2nd style of bubble without divots. These bubbles are often a little larger than the divoted bubble. [see example pics below]
With the hole in the card i don't see much more than £20 value here. I would double check everything i've said with Joe as he is often the man for the final word on trilogo variants.
Here's a good picture showing the 3 bubble typles all with the same figure. As you can see, the divotless bubble is slightly larger than it's divoted counterpart.