Ride to Harwich Anyone?

I'm setting off on Saturday 5th April at noon from BikeFix in Lambs Conduit Street.  If you can manage 125km - about 70 miles - at gentleman's pace then you can join me on the ride to Harwich for dinner, possibly in the Samuel Pepys (we are researching this, recommendations welcome). Thence choice of ferry to Holland at 23:15, last train back to London at 22:28, or find lodgings and ride home via some nice quiet Essex/Suffolk lanes on the Sunday.