How reliable is Bede’s Ecclisiastical History of the English People?

It is often regarded as a highly detailed source, reffered to even as our most informative account of the times, but it is worth remembering that nearly all of Bede’s information was from other sources as well. It is noted that he never travelled, and barely left his monasteries, so how much trust should we place in a source made up solely of handed down information, no doubt also containing its own bias.