I was going to suggest volunteering too - have a look at the Guardian. However, it might lead to helping in a youth club or similar which will probably be worthwhile and interesting and allow you to meet lots if nice people but not necessarily nice 40ish men. You could also join some rambler association or similar - groups of people who go for long walks at the w/ends. Also if you are from another country, you could try and look for a social circle involving people from your country. Have you thought of joining Mensa? They have social events all the time including the w/ends. You will have to get over your shyness though to muster the courage to go along to their events. The following may not be your cup of tea at all, and nice 40ish men will be thin on the ground, but I'll write it in case it gives you inspiration: have you thought of finding out if your local authority has a scheme for respite care/mentoring: the idea is taking kids out for the day to give single parents a break. You MAY meet someone once you start going to parks, farms, playbarns, etc., but likely as not they'll all be married with kids, so this one is only viable if it attracts you in itself.