Aye the 'new' penny also features the portcullis. ('New' is of course a relative term - these coins were introduced in 1971!) I hadn't spotted the connection before. In a sense it's not surprising that some of our coins feature medieval architetural features. Not because we're stuck in a time warp or we're always looking backwards (although a case can probably be made for each of these!). No, the reason is that the portcullis is the symbol/ icon of the Houses of Parliament.
On reflection, I wonder if I'm oblivious to the coins that I use (not very frequently) because of the general affluence and associated carelessness of our lifestyles or if I simply haven't noted the detail because of all the other nonsense swirling around inside my head?
This random musing begs another question - what else is right in front of us that we don't notice?