I like the idea of a swing on a frame under a tree instead of attached to the tree. With Oliva engraved
Kingdom Arc Garden Swing Seat - very cool, but could DIY with PVC? Maybe not the support frame.
Bespoke arbour with swing from The Garden Trellis Company...
Bramblecrest Cotswold Double Cocoon Garden Swing Seat | Internet Gardener
Wooden Swing Seat - Large Heavy Duty 3 Seater Outdoor Garden Swing Bench | eBay £400
Google Image Result for http://www.sittingspiritually.co.uk/images/pergola/oak-pergola-tranquillity-swing-seat-fanback.jpg
Quality wooden swing seat and Pergola
Oh for a day like this! Stunning Harmony painted in Farrow & Ball's Plummett
Romantic suburban garden - Traditional - Landscape - east midlands - by Jane Harries Garden Designs