Quote Paul Youane="Paul Youane"Might as well ask here as its kind of random fact:
If I buy first class stamps now in bulk will they always be valid, eg have no expiry date?
I fancy stocking up with these: [urlhttp://www.royalmail.com/portal/rm/shop?catId=9300091&pageType=Others&pageId=shp_prddetails&product=prod86670032&parentCategoryId=cat86150006&categoryId=cat86160009[/url'"
Yes as long as it says 1st class.
It's a bit like bank notes. No matter if they are legal tender or not the BoE will always honour the value, although in the case of old notes the bank profits greatly from the huge seigniorage.