Taking you very literally I don't know what the most reliable source is, nevermind claim it to be the Telegraph, but I'm not really sure what the implication is, or perhaps rather its reasoning? It's a perfectly respectable paper; (along with The Times) a paper of record.

> UK Telegraph isn't the most reliable source.

Why not? As far as I am aware it is a legitimate and decent journalistic news source. It might have a political leaning, but for this sort of reporting I don't think it would give their preferred political party and leverage.