Or try
http://www.travelcollection.co.uk/
I've been with them about 8 or 9 times. Always meet great people but definitely not single romance type groups. Mostly couples, friends & singles who enjoy company, sightseeing & relaxing . Best for long haul holidays in particular - i.e. South America, China, Borneo, Nepal etc but they do have some great quiet beach holidays in the Seychelles & Caribbean.
I've made some good friends on their holidays & am off to China in November with a friend I met 6 years ago on a Travel Collection holiday in Nepal. We live 200 miles apart but keep in touch & meet up now and again.