Park Life is a proper mid-green with warmth in it, so the worst thing you can do is hang it next to brilliant white — it drags the green dirty and cold every time. The trick is to keep everything warm.
Start with the woodwork. Go for a soft chalky off-white like Farrow & Ball's Au Lait (LRV 80) or Paper III from Paint & Paper Library (LRV 75.3). Both are creamy enough to flatter the green rather than fight it, and at those light levels they keep skirtings and frames feeling fresh without that clinical bounce you get from a bright white.
For accents, this is where Park Life really sings. It loves anything earthy and aged — terracotta, oak, aged brass hardware. Mylands Cigar BH.20 (LRV 11.8) is a gorgeous deep tobacco-brown that grounds the scheme and pushes it toward a proper Arts & Crafts feel — think a feature joinery wall or the inside of an alcove. If you want a bolder, more unexpected partner, Dulux Fuchsia Falls 2 (LRV 29.8) brings a dusky pink-mauve that plays off the green beautifully on a single piece of furniture or a soft furnishing.
The "but what about" here is usually: *can I use grey?* You can, but be careful — a cool grey will flatten Park Life and make it look mossy and damp. If you want a neutral break, keep it warm and chalky, which is exactly why Au Lait works and a steel grey doesn't.
Practically: paint a decent-sized board in Park Life and stand it against your Au Lait or Paper III sample before committing. North-facing rooms will deepen the green, so the warm off-white becomes even more important there. Bring in your brass and oak as physical samples too — the metal finish does half the styling for you.