This is looking promising - at the mo April 2 and April 16 are our best contenders, and I think April 2 could be the winner as it's sooner.
Thinking about it on the way to work, had a couple of options
1) We meet at a station and include the walk up to the hills as part of it
Pros: easiest to arrange; no cars needed; longer day
Cons: more walking than maybe everyone wants; longer day
2) Party 1 starts from the station and meets with Party at a car park on the hills
Cons: slightly more hassle arranging
Either way, we could start in the morning and go via a pub/cafe-on-the-hills for lunch, and those who want to can go grab evening food in Malvern before heading home.