i am travelling on club world from Singapore to London and i understand from their site that the maximum check in luggage is two items at 32kg each. As i am relocating to the country, i currently have more than 2 luggage but total weight should not exceed 64kg. Do you know if BA is strict on the 2 luggage policy and that i have to purchase additional luggage allowance regardless?
You can increase your luggage allowance now in advance, by buying additional bags through Manage My Booking on ba.com. (If you have a ticket issued by a travel agent you may have to go back to the agent to discuss this, but for most tickets it will work fine.) Buying additional pieces online is cheaper than doing it at the airport.
Each additional bag you purchase can also weigh up to 32 kg.
As Berwyn says, if you hold Oneworld Emerald status through top tier status in any oneworld airline, then you will be entitled to one additional 32 kg bag for free (i.e., you would receive three free bags).
If you are intending to take more than nine pieces you may have to contact British Airways directly by telephone because of a systems limitation.
BA provides a free third bag in CW only for people with BA Gold/OneWorld Emerald status. Given that this is a benefit for people with that status level, I rate your chances of an extra bag as roughly zero if you don't have that status.
It's worth noting that you can carry two items of hand luggage weighing up to 23kg each on board providing you adhere to the size limits. It's unlikely that your hand luggage will be weighed or measured providing it's not too obviously extreme.
If you come with 5 pieces, yes it will be an issue. If you have 3 and you are loyal customer for them (with a status), then you have a good probability to be able to check-in all your luggage without any issue. If you ask me for a percentage, I would say 30-40%. They might also ask you to pay for something extra.
I thought I should mention luggage allowances are higher for nearly all international flights to & from the US (& Canada).