Cucumber pollination?

I started my cuc's off per packet instruction and now have a 20" fellow in my kitchen.  It has had one male flower open (Supposed to be an all female variety so not quite sure why he was there) and there is a tiny 3/4" cuc dangling.   Does the flower need to be polinated by insects when it opens?  Don't suppose it is self polinating like toms???

I believe most types (not all) require the male flowers to be removed as a pollinated cucumber is supposed to be sour?

Novice Q - how do you tell the difference between male and female flowers?

This is a courgette, but the principle is the same.

GREENHOUSE CUCUMBERS.

All-female F1 varieties.  This is a new type of Cucumber which is revolutionising the cultivation of Cucumbers. Unfortunately the seed is very expensive, but the results that are coming in, make the cost worthwhile. As the name suggests, they usually produce only female flowers, doing away with any pollination problems. Occasionally, some all-female varieties produce a few male flowers which should be promptly removed. This may happen if they have been stressed.

Traditional type of Cucumbers. This type is suggested for cool greenhouses and  usually produces long, straight and smooth green Cucumbers. Remove all male flowers as they form from this type of Cucumber, to prevent pollination of the female flowers and resulting bitter fruit.

OUTDOOR or Ridge CUCUMBERS.
These are really only suitable for the South of the UK in a sheltered and sunny location. You can of course grow outdoor cucumbers in a cold greenhouse in the North of the UK.

When growing these outdoor Cucumbers, leave the male flowers on the plant as the female flowers require pollination.

Yes, it is from my own site.

So is it possible to grow marketmore inside a greenhouse?? or does it get too warm for them??? I have never grown them before and thought they all grew inside!!!

Thanks
Louisa