three light in the sky that led to a big black silent triangle shaped craft.

I was driving my service bus out of Leeds cit centre when I saw three lights in the sky about 1.5 miles away, at first I thought it was an aeroplane but the lights didnt seem to be moving then the middle light slowly started to fall downward but there were still three lights there, I had one passenger on the bus so I called him to come and have a look at what I was seeing we were getting nearer and it still had not moved, we eventually finished up underneath it on a dual carrigeway I stopped the bus and we both got out to look upwards there was this BIG triangular shaped craft stood perfectly still it was black there were no lights underneath after about 45seconds it started to move very slowly with no sound whatsoever I had turned the bus engine off so we would have heard any engine type noise it slowly gained speed and went off over the local copper works and power station. when I got back to the local bus station I told my fellow drivers what I had seen as I was estatic but all the lads just pulled my leg for days (na noo na noo) so I have kept Quite about it ever since but I know what I saw and that is all that matters to me.
Date is approximate.  PD