[Jon]

I get the feeling ITV will annoy the long term fans and keep the same overall look and feel of the series permanently, maybe just changing the very centre of the eye, rather than each series having a completely different look

It seems to be the trend to establish long term brands that stick around these days

I think the centre of the eye is the bit that won’t change, that seems to the most useful device. 

Think they’d have gone for something a lot more generic for the outer eye if they weren’t going to change it for potential future series.