It's a strong accent and it sounds Brummie until I hear you talking with someone with a Brummie accent and then it's plainly not.

Lancashire? No, but something similar. Curiously, your up-and-down intonation is quite similar to nattydreadi and he's Northern irish by way of Sunderland, which tends to suggest North east.

Sorry, accent and regional variation in speech patterns fascinates me.