Thanks for the advice.
I agree that the honeymoon period will always end, and to be honest, we do still find each other sexually attractive, it's not like we've stopped having sex. For the most part , having less sex is probably down to her feeling less confident with herself (relationship contentness + food!). If I thought there was no attraction or lust left, I'd be a lot more tempted to call it.
I'll heed the advice of most here and let her cool off, lots on for me, so I'll back off just being around all the time. With the break in work coming it'll be a big change for both of us so that will shake things up.
Question is whether to do it suddenly, as an obvious knee jerk reaction, or over the next month or so and then keep it that way.