if u ever come to melaka, u can get the tern cheaper here...

Actually Pedalspot's prices are always higher when they take over a product rights. Look at Rockshox nowadays. Anyway, Brompton's prices were very hard hit by our currency's slide. They started with 5.8K if I am not mistaken and now it is in the 7K region for the 6 speed. If you are really interested, there are 4 more units here in Taiping from the 1st batch. Initially the minimum order was 10, so I guess the shop sold 6 already and really trying to get rid of the other 4.  When I moved here, I had the chance to actually buy 2 (EPF withdrawal) and the boss says he can give me a very good price (old price) and my guess was less than 12K for 2 bikes but he did not want to confirm till I actually wanted.

So, I was sleepless for a few nights, whether to get it or not. Then I decided to get another mini velo to complement the other that my wife rides, which is more practical to me as I don't need to commute anywhere and I can fit in either 2 mountain bikes or 2 mini velos into my car easily (without any racks) . KTMB Komuter here allows bikes for an extra RM2.00 per bike (full size) so Brompton doesn't not make sense to my needs.
The mini velo (modified with straight bar) are much more agile, lighter, faster, wider gear range. more comfort (chromoly) and most of all it cost less than a Brompton even with a 20 speed Ultegra groupset.

That's why I skipped the Brompton which I have been pondering on since my Dahon days. But if you are really interested, head here to Taiping, only 4 left! Maybe slightly less than 6K,brand new! 2 black edition (racing green and lagoon blue) and black and the final one red.

That's probably chain rub (the chain rubbing the FD inner plate) and it's common even in mountain bikes but precise tuning can eliminate that actually. But then riders don't use that setting anyway. If it is irritating, then shift down to smaller chainring and and bigger smaller rear cog. But if you are using Tiagra shifters, there is a 'quarter shift' or trimming setting where a slight touch will move the FD cage a little to avoid the chain rub. I am talking about flat bar road bike shifters, namely the Tiagra and the Shimano SL-R780 shifters. As for STI shifters, most have this extra adjustment.

To actually tune it involves a lot, the height of the FD, the angle of the FD, the low and high adjustment screws. Heck, I won't adjust it except my own bike la ,  , not to mention bike shops. As long as it shifts smoothly, kautim!

What I mentioned was if it is chain rub, then don't use the bigger chainring with the biggest cog at the rear, NOT don't use the chain ring totally!  Use the chain ring when using other smaller cogs, like  12T, 13T, 14T ,15T, 17T, 19T, 21T, 23T,  and 25T cogs. Don't use the 28T cog when you are using the bigger chain ring. When you want to use that ratio, use the smaller chain ring and the rear cogs to match. I am assuming you are using the Tiagra 12T/28T cassette.

Eg. 53T front chain ring x 28T rear cog is 53/39 x 28 inch wheel diameter gives you 53 gear inches

      39T front chain ring x 12T rear cog is 21T x 28 inch wheel diameter gives you 52 gear inches which is almost the same gear ratio as the above.

So, what I meant was, if the chain rub is irritating you, then use the bottom combination instead of the top combination for that gear ratio.

MAybe you can change the whole Java groupset over to your roadbike........hahahahaaha 

Sounds to me like the chain outer wall is rubbing the next bigger cog, or the chain not sitting flush on the smaller cog. Is it sound like constant clicking. Google YouTube on how to adjust the Rear derailleur barrel adjuster, and the concept of adjusting the high and low screw. It's like that issue since the chain ain't touching the FD.

I know exactly what you are saying.  Mine does that too, I think it is the fact that the chain moves around a smaller cog, plus the RD is also under less tension. I think it could also be due to the length of the chain.

Worth checking and make sure the chain is properly lubed.

When a new chain is purchase or when it comes with a new bike, the chain IS NOT LUBE YET ! Many are mistaken that the slimy and sticky substance on a new chain is lube but that is just a protection against rust. 

If there's nothing obvious that is wrong and the gears are smooth when peddling, you are not going to damage anything. If you find that you are in this high gear all the time, then you may want to go for a larger chainring at the front. Another thought is to try another cassette and see if that rumble can still be felt?