To be on the safer side, you should stick to accept total order of no more than invoice value of RM 400, although generally the max value set by the customs is RM 500.

Weight plays an integral part too, if its heavy it gets taxed too.

Good luck bulking!

Pay attention on the shipping method. The best safest way is to ensure that the item is sent at least using a signature service (must be signed for by the recipient). Worst come to worst is using Royal Mail International Signed For, which is the equivalent to Pos Daftar in Pos Malaysia. If this is used, at least this is the safest way because Pos Malaysia liaises with Royal Mail UK when a shipped item is sent to and from UK using either Royal Mail or Pos Daftar. 2 different tracking codes will be used (one from Royal Mail and another from Pos Malaysia) to tie the tracking movement of any item.

Another safer way is to use courier such as UPS or DHL. But this is a bit costly.

From what I read in the arsenal.com online store:
Your shipping fee might be £18.00.

If the order is above 2kg, definitely will use courier. But please don't make it above that, for sure you will be taxed because 1 jersey is around 0.3kg (approximately) so imagine how many jerseys are that!

The safe rule is to buy 3 jerseys (most). Ensure that the total price (including shipping) is not more than RM400.. If exceed.. there is a slight risk.. If it is more than RM500.. then you might get taxed. (Mods.. don't worry, I've confirmed this with Malaysian Customs and it is legal to share this info to the public. The customs are happy that we know the general rule).

But as always....... these rules does not 100% guarantee you that you will be taxed. If you are taxed, then it will happen. But try to avoid the risk.