Mike J,
I can't comment on the occurrence report as I haven't read it yet.
As far as your actions,then I think you did the right thing.Often the weather in this part of the world(NE Scotland) can deteriorate much quicker than forecast.If a light aircraft pilot needs assistance in bad weather for an IFR approach,then I will always do my best to help.If they don't have the plate,then it's easy to give out the info.
I have seen too many light a/c crash,with people killed or seriously injured as a result of press-on-itis VFR in bad weather.That's when you can't help them,as they get below radar and even R/T cover.
As far as vectoring then yes we would rather do that,rather than a full procedure.If it's very quiet then sure,but that isn't the case much anymore,so it's easier to fit you with vectors.
I also have a PPL(lapsed),with Night rating.Only did 1/2 the IMC,but it's a real life saver.