Many thanks Gladman, they look like unmissable sites. Clach an t-Sagairt reminds me a bit of the little wedge tombs we saw in West Cork. I've made a note of all four sites and, if viable, will take my laptop with me to use for reference. My companion has a small car which we will use when we need to but want to get as much walking in as we, or rather I, can manage.

Thanks again to everyone who has replied. All very helpful and much appreciated.