Which one? There were at least 3 66's I can think of from the top of my head that have been broken up.
2 of them went for dramatic slides in poor weather in scotland and ended up ditched as a result. The Eddie engine that spent some time painted black while it was repeatedly sold on and carted around for fun was one of them. That was 66 048 and could be the loco you are thinking of, while 66 734 suffered a similar fate and was broken up where it landed.
Then of course 66 521 which had a head on arguement with a derailed GNER 225 set causing both to come to grief. It languished out of sight in (doncaster or crewe) before being disposed of. 66526 was ordered as a replacement and named after the driver lost in the disaster. Meanwhile GNER named the training school in Newcastle after their driver which NXEC, DOR and VTEC have honoured.