If it’s going to be really special, try and ride a few.
Even if you have to spend £30 a time borrowing them from bike shops, it makes you so much more settled on the final choice and it’s really fun ragging a few different bikes down the same trail.
Plenty of shops have Cotic demos and some of the other manufactures have bikes they can move from shop-to-shop for you to book.
My shortlist around £400 would be:
Cotic Soul
Cotic BFe
Stanton Slackline (I know this one may be tricky to demo)
Transition Trans Am
One of those skinny-tubed Charge Dusters
Ragley Piglet
Or something like that anyway.
BTW, I’m 40 this year too. sob…