In reply to Gary Latter:
Yes, it's an important point. I'm over the moon about the guide, think the climbing looks great, and Al Whitworth has done a great job. But I realise my enthusiasm is centred on my sister now living over there - and having access to her car. Really looking forward to getting over in the summer months next year.
Taxis are very expensive on Shetland, so it's possible that leaving a car in a residential area in Aberdeen (or using JustPark), walking/cycling to the ferry, then hiring a car on arrival at Lerwick as a foot passenger (having kipped in the back of the cinema) could be the cheapest way to get climbing if you're not living or working on the islands.
For the very intrepid, a fair amount of climbing seems to be within a half-day cycling distance of Lerwick. Though that would be an interesting, but very different type of trip.
D.