That's a good achievement, given the dates. Which did you enjoy most and which did you find hardest?
Mille Cymru was the hardest, no question about it. The other 3 have an easier 1st section which allow you to build up a time buffer, whereas the Mille Cymru was tough from the start and didn't ease off until Snowdonia on the third day. And then it got hard again between Betws-y-Coed and Bala which was mostly done at night and partly in the rain.
Which I enjoyed the most is a more difficult question because each event was great and I tried different stuff on each. Trying to bivy on the west coast of Scotland was a mistake due to the midges but the loop around the Ardnamurchan peninsula stands out as the best cycling I did all year (until the disappointment that the Glenuig Inn only served soup for lunch on a Saturday, I'd been looking forward to a pub meal for two days. Absolutely crushed). The arrivee was great as well since a lot of people stuck around at the end.
Going into the ACME Grand, I had sleep deprivation from the heatwave which made the whole event a challenge. The terrain was also harder than I was expecting, dunno why, the event page listed 11,000m of climbing so it wasn't going to be flat. I didn't book any accommodation and bivvyd the whole way round which is the first time I'd tried that on an event. I was going to ECE this up to a 1300 but gave up on the 200km return leg when I finished way later than expected. The mountaintop coffee stop and the whole garden at the arrivee breaking into applause as each rider arrived were the highlights.
I did the Mille Pennines last year so it was nice knowing what to expect this year. I thought the route changes this year were great and made the route flow really well, it didn't seem like were were cycling through Hawes as much. I got a lot more sleep on it this year and managed to cycle up more of the 33% hills then I did the previous year. Still walked a few more than I would have preferred but having done the ACME Grand the weekend before I was happy with the improvment.
The Mille Cymru was tough. Knowing so many people on the event was nice, it seemed like I was constantly running into people I'd met on the events this year. The Elan valley with the Van of Delights was fantastic. Rolling into the finish with omloopnova was the highlight as we'd spent a lot of time together on these events and knowing he was also doing all 4 of these kept me going.