Thanks again for all your suggestions. Of course I have a alternate route returning HKG-JNB-CPT and ending there.

What are the contact details of BA's RTW desk in London or the U.S. (e-mail and phone number) ?

Check you PMs. BA also has very good contact details @ ba.com.

Thru BA.com I found the Lady in MRU. She is kind, but you all are right, that I am better off sticking to experts.

Thanks for the PM.

Hey Guys, I came across the same problem.
I booked a Done4 ex MRU and went via CX HKG-JNB to end my itin, But BA MRU said tha tI would have to end in MRU, and MRU-LHR-xxx-xxx-xxx-LHR-MRU is allowed. I told her how is this possible since the rules specifically state that it is not. She said the rules are different in each country of origin and she send it to pricing priced it up and my itin is reserved.
I however called BA RTW US and they were actually apalled, and clearly stated that it was wrong.
I told her I wanted to confirm with BA RTW US before and she told me the BA RTW Agent in MRU is clearly absurd. Anyhow, she put me on hold to speak to a superviser. She came back and told me it was actually possible, and that the rule are different for MRU since LHR is the only gateway..
Dunno guys, but i'm keeping my fingers crossed

another thing...
I was quoted taxes of 35,205 MUR, which is about 1,143 USD.
Isn't that a bit high??
I did a Done4 ex ist, this year and taxes were only $300 usd.
I'm making the same stopovers in US, and the only difference re the two intl stopover..
Does this sound right to you guys?

If they ticket it you're good to go. Just watch out for bad news if you go through a reissue.
It sounds like BA fuel surcharges and LHR t/o fees are whacking you big time.

BA fuel surcharges are around $44-$60 per long-haul segment and UK air pax duty is GBP 10 and GBP 40 per Domestic/EU and other destination respectively. I don't think that this could account for a difference of some 800 USD.

But QF is sticking on surcharges of AUD25 to AUG80 per sector; CX is charging +/-USD50, LA USD25-40, so a D/AONE4+ might have - what - 15 segments on surcharging airlines? Plus landing fees, war charges, etc. - it could certainly add several hundred dollars to the bottom line. (Also noted that fuel charges are added by "sector" - not "segment." Don't know if that makes any difference in this case but I suppose it could.)

Having also done a DONE4 ex-IST last year I would also have to question the US$300 figure. Ours were more like $500-$600.

Wow, yeah my taxes were definitely around the 300 range ex ist.
I just send a request to MRU and they said they repriced, to avoid duplicating some taxes, and now it came to about 500-600 usd, which i'm ok with. $1100 def seemed way too high for me.

Good show challenging the surcharges and getting them reduced. Too bad there's not an on-line resource equivalent to the tax tables the rate desks have access to. It would be nice to know with moderate certainty when a tax calc is significantly off base.

On the routing, it's always attractive to take "yes" for an answer, but I'd second the comment that one should be very cautious if there's any chance of wanting a reissue after commencing travel. There are plenty of folks even at rtw/rate desks that have important gaps in their personal knowledge of xONEx rules. If you're right and are confident, you can generally appeal past the wrong-headed agent, but taking advantage of an incorrect "yes" leaves no recourse except perhaps begging on bended knee.