Oil leak now fixed:

Basically the breather was the wrong way round, however unfortunately whilst re-checking the gearbox level I dropped a piece of cable tie into the box never to return, no matter how much I fished it! So I flushed the oil, in the hope of removing the offending object, no luck! I tried again the next day, but it appears to have sort of liquidated into the oil. So I will change the gearbox oil fully in the next month by removing the drive shaft. She is running fine at the moment and the gearbox is as smooth as ever, so fingers crossed!

Some pictures of the gearbox flushing (wondering if anyone can tell me what's going on with the gearbox oil, is it oxygen in the oil making it milky and when it settles, whats that gray stuff is that iron)?

Oil coming out of the filler (previously been over filled)
http://www.flickr.com/photos/65056499@N05/6082906087/http://www.flickr.com/photos/65056499@N05/6082906087/ by http://www.flickr.com/people/65056499@N05/, on Flickr

http://www.flickr.com/photos/65056499@N05/6083448734/http://www.flickr.com/photos/65056499@N05/6083448734/ by http://www.flickr.com/people/65056499@N05/, on Flickr

Decanted it into smaller containers:
http://www.flickr.com/photos/65056499@N05/6082907059/http://www.flickr.com/photos/65056499@N05/6082907059/ by http://www.flickr.com/people/65056499@N05/, on Flickr

Settled with this gray stuff at the bottom?
http://www.flickr.com/photos/65056499@N05/6082896595/http://www.flickr.com/photos/65056499@N05/6082896595/ by http://www.flickr.com/people/65056499@N05/, on Flickr

http://www.flickr.com/photos/65056499@N05/6082895589/http://www.flickr.com/photos/65056499@N05/6082895589/ by http://www.flickr.com/people/65056499@N05/, on Flickr

Thinking its some sort of addative?
http://www.flickr.com/photos/65056499@N05/6083452424/http://www.flickr.com/photos/65056499@N05/6083452424/ by http://www.flickr.com/people/65056499@N05/, on Flickr

Flushing through with new oil:
http://www.flickr.com/photos/65056499@N05/6082909887/http://www.flickr.com/photos/65056499@N05/6082909887/ by http://www.flickr.com/people/65056499@N05/, on Flickr

I managed to fill from above by removing the air pipe and using a funnel:
http://www.flickr.com/photos/65056499@N05/6083449570/http://www.flickr.com/photos/65056499@N05/6083449570/ by http://www.flickr.com/people/65056499@N05/, on Flickr

The gearbox seems to be running ok at the moment, but I will change the oil again in the next month to flush the remainder of the cable tie.

Little bits, the devils in the detail:

http://www.flickr.com/photos/65056499@N05/6082897817/http://www.flickr.com/photos/65056499@N05/6082897817/ by http://www.flickr.com/people/65056499@N05/, on Flickr

replaced with:
http://www.flickr.com/photos/65056499@N05/6082898689/http://www.flickr.com/photos/65056499@N05/6082898689/ by http://www.flickr.com/people/65056499@N05/, on Flickr

its a nightmare to find a mint one of these for the o/s, they are always cracked!

Had another stab at the water ingress and has really reduced it! Think the dash will need to come out to fix it fully though! sealed all the bits up in the scuttle panel with roof sealant, far more durable than bathroom sealant!

Cleared around bulkhead so I could get good access (also used the time to give this area a good clean):
http://www.flickr.com/photos/65056499@N05/6082900719/http://www.flickr.com/photos/65056499@N05/6082900719/ by http://www.flickr.com/people/65056499@N05/, on Flickr

Used roof sealant to seal all suspect areas, then refitted all components:
http://www.flickr.com/photos/65056499@N05/6083442060/http://www.flickr.com/photos/65056499@N05/6083442060/ by http://www.flickr.com/people/65056499@N05/, on Flickr

http://www.flickr.com/photos/65056499@N05/6083443706/http://www.flickr.com/photos/65056499@N05/6083443706/ by http://www.flickr.com/people/65056499@N05/, on Flickr

http://www.flickr.com/photos/65056499@N05/6083442828/http://www.flickr.com/photos/65056499@N05/6083442828/ by http://www.flickr.com/people/65056499@N05/, on Flickr

Gave the engine another quick spruce up:
http://www.flickr.com/photos/65056499@N05/6082904135/http://www.flickr.com/photos/65056499@N05/6082904135/ by http://www.flickr.com/people/65056499@N05/, on Flickr

http://www.flickr.com/photos/65056499@N05/6083445668/http://www.flickr.com/photos/65056499@N05/6083445668/ by http://www.flickr.com/people/65056499@N05/, on Flickr

Also bought this the other day, so I can finally get under the car:

http://www.flickr.com/photos/65056499@N05/6082913803/http://www.flickr.com/photos/65056499@N05/6082913803/ by http://www.flickr.com/people/65056499@N05/, on Flickr