Do many plecos lay eggs in home grown homes as iv just looked at your tank and iv got about 10 baby plecos roughly 12mm big and iv read up that they are hard to breed and woundered if anyone else has?

Yes, it is possible for plecos to lay eggs in home aquariums, especially if the conditions are favorable. Many species of plecos, particularly the common bristlenose pleco, can breed in captivity if they have a suitable environment, including a breeding cave, clean water, and proper diet. The presence of baby plecos in your tank suggests that breeding may have occurred, which can happen even in home setups. If you continue to provide a good habitat, you may see more breeding success in the future.