In reply to Crammy:
Thanks all for your responses.
We did it last thursday and it proved to be a good day out, although a tad commiting without really knowing whether it was possible and not enough daylight to return.
Points worthy of note:
Route finding on the first part between the main summit and the fins was a little tricky - just keep watching out for the red dots. They are visible in this direction but not always obvious.
Down scrambling on the approach to the fins is not too difficult (even though in the description it suggests grade 3). The abseil off the belay bolt (single) is about 20m to the ground direct but could be a bit shorter if you land upslope.
At the long E-W abseil the route finding is not a problem. there are few choices! Anyone who has previously done it E-W will spot the ramp running back up from the bottom of the abseil and instead of going down it move up onto the ridge crest, staying just on the south side of the crest and follow it round. It looks rather improbable with a few exposed moves but there are good holds all the way. As you pull around the end of the crest you are suddenly directly above the top of the abseil. There's a newish piton and some tat through a thread allowing a short abseil (about 8m) onto the platform at the top of the E-W ab. Best to gear up at the top of the ramp as there's not much room at ab point. After that we didn't use the rope again. The scambling up the further 3 short abseils is very exposed but not difficult.
We're not the fastest (nor fitest) on the hills but for comparison it took us 7.5hrs E-W last year and 8hrs W-E this year. That's car to car from the south side (no cattle involved).