Rear Axle Breather Blocked

I changed both seals on the back axle of the Vogue a few years ago but I noticed when re-doing the brakes about a year ago (to get it back on the road), that they were still leaking a bit. Well on the hillman yahoo list, the subject of pressure building up in the back axle came up. It seems that after 45 years or so the rear axle breather hole is generally blocked and the slight pressure causes oil to be expelled either via the axle bearing seals or the differential pinion seal. It took some scraping and about 15 minutes to find it even though I had measurements of where to look. I had to wash the are in petrol to find it. Yep - blocked!
This is looking down on top of the axle casing. The black vertical pipe is a rear shock absorber.

Hope that fixes it...