Damn, this happened with my parents' DVD player, but it was greenish, not blue.
When I was up over Christmas I tried some logical experiments. SCART leads were not the problem. The DVD player was not the problem, as it played perfectly on their other tv, on both SCART leads.
I've looked this up before, and I suspect some RGB/Composite Video discrepancy between what the DVD player outputs and the TV expects. Traversing the DVD player menu seemed to confirm the output was RGB, but I couldn't see the equivalent on the TV on-screen setup menus.