Thanks all for the comments and suggestions. I'll keep you posted, as I've not had any success with local Stratford welders (they havent heard of Birmabrite and certainly haven't a clue about welding it!) Even the Dunsfold Landrover centre, once the font of all knowledge hadn't got a clue. I ended up with a salesman who started waffling about impurities in Birmabrite (which I believe he heard the name from me for the first time!!)and after thats done, i always glue a patch (old birmabright) with araldite behind it to avoid further cracks.