Whilst looking up some Scottish relatives I came across this site. It is funded by National Lottery, and gives Monumemtal Inscritions, along with graveyard detals , maps, and photographs of headstones.
The drawback is presently it only covers Bedfordshire and Norfolk.
The small village of Dores in Scotland is hoping to add their details, so it may be site to watch in the future- if your relatives are off island, Colin.