Thank you guys for all the comments.
@ElGonzo - I agree- but this should work both ways in my opinion. I could consider paypal payment if the buyer have a track record on the forum. This to avoid, based on a similar principle, that a buyer with no track record on the forum could get the bike and open a dispute later for no real reasons.
@Light_EDDed - Thanks, I did some research prior the sale and while it's true that you can find a Nirone for £400 it would have lower specs (SORA groupset, generic stem etc..) and also different colour scheme. Even looking at ebay right now, all the 'buy it now' Nirone 7 are sold between £375 (only one bike at that price and with a very basic colour scheme) up to £725 (with similar specs as mine) so my asking price should really be aligned to the avg.
Also, a quick note to add that the bike is registered on bikeregister.com site and the ownership will be transferred to the new owner.