I've seen a Cyjon mod that does this, so I know it's possible. Would it be in the WantsTuning.package?

Thanks anyone for any help.

No, look at 'Wants - Check Trees' holder, group 0x7F739728
You'll see a lot of BHAVs named like 'CT - Test - Lifetime Want - ...' (the check trees)
The game runs those to check if the sim is eligible to roll a corresponding LTW. In them, look for aspiration checks and change values as you see fit. Const 0x013E:0x01 is Romance, etc.

I've edited all of them to work with my LTW Chooser, you can look at it if you want more examples.

One thing to note: if you want an LTW to be for all aspirations and decide to disable all aspiration checks, make sure to add a check to disallow the 'Grow Up' aspiration, otherwise all your sims will get that LTW in childhood, and CAS sims, too.

Maybe it in BHAV "CT - Test - Lifetime Want - *" in the wants group 0x7F739728. You can see that each has some conditions to do with already having achieved the want plus aspiration.

I've never changed this.

Thanks to you both for your speedy reply.

I forgot to mention that I'm a modding noob, so please forgive me if I seem slow at understanding basic SimPE concepts. Using the example in the image attached, if I wanted to change the Aspirations, I would need to alter the Const., would I need to do anything else?

You extract this file into a new package. Then change the number 03 or 06 (fifth in the operands box) between 1 and 9 until the name of the desired aspiration comes up.

The two aspirations are both accepted if one ok, OR if other then ok, else false. If you want there to be only one aspiration, you can exclude the second line from the flow by changing false condition (red line) to Return False. If you want three aspirations, click Insert via False on the second box, and now you have three possibilities.