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Ignoring the ride to / from Paddington to get the train, it was about 75miles each day. It was mostly road rather than path / track but predominately really quiet country roads - very few segments had much traffic at all. The only bits that stand out as a bit car heavy were the route across from Abergavenny to Symonds Yat (on day 2 - the equivalent E to W route on day 1 was lovely), and the first few miles in South Wales going up from Chepstow.
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and @M_A_X
Route out for the ride I discussed above is attached - this is the GPX file of where i actually went so may be worth checking for any wrong turns before just following!
I didn't do much on the gravel side of things (a bit near Symonds Yat and Tintern Abbey, you could tweak the route to do more if you wanted) but I did a great trip a few weeks ago - train to Bristol Parkway open return (so did a modified route back the same way the next day), cycle over the Severn and up the Wye Valley and then across into the Brecon Beacons, up over Hay bluff towards Hay on Wye to camp out. Roughly reverse course the next day, taking in some of the different bits in the Wye valley.
Beautiful scenery throughout and really varied. Can dig out a GPX route when I get a chance, but I was really pleased with how well the trip went.