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https://send.royalmail.com/?iid=RM0624_NAV_SEND is good, it'll tell you how much it is based on dimensions/weight.
You can then work out whether you can cover that with stamps.
Large Letter is anything up to 2.5 cm x 25 cm x 35.3 cm. The price depends on the weight:
- up to 100g: £2.50 (£1.55 2nd class)
- up to 250g: £3.30 (£1.90 2nd class)
- up to 500g: £3.30 (£2.30 2nd class)
- up to 750g: £3.30 (£2.50 2nd class)
1st class stamps are £1.35
2nd class stamps are £0.85
1st class Large Letter are £2.60
2nd class Large Letter are £1.55As others have said, picture stamps are valid forever but stamps with just the monarch's head on them are only valid if they have a barcode. If you've got a load of old stamps without barcodes you can send them off for replacements: https://www.royalmail.com/sending/barcoded-stamps
My FiL had hundreds of old denomination stamps that he got to swap out.
A lot of the time I just use the royalmail website to print my own postage, stick it to the parcel and then post it locally (if it's small enough to fit into the postbox) or take it to the local post office or sorting office (both of which are half a mile away from me). Arranging the postman collection is unlikely to work for me as they'd probably come at an inconvenient time.
- up to 100g: £2.50 (£1.55 2nd class)
It's a long time since I've sent something in the post that isn't a letter or parcel. I've got a small jiffy bag that I think would come under Large Letter. Can I just stick a few standard first class stamps on and that will do the job?
And what stamps work nowadays? I have a vague memory that they changed but picture ones are still usable or something.