“B69-Great Britain 1960 Europa CEPT Conference Stamps 6d & 1s6d Mint/Unused”

Title
“Great Britain 1960 Europa CEPT Conference Stamps 6d & 1s6d Mint/Unused”
(You can adjust “Mint/Unused” to match your actual condition.)
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Category
Collectables → Stamps → Great Britain → Commemorative
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Condition
Mint Never Hinged (if no hinge marks, gum intact)
Or Mint (with hinge)
Or Lightly Hinged / Very Fine Unused
Include high resolution photos (front, back, margins) and mention any flaws (toning, gum disturbance, perfs etc.)
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Item Specifics
SpecificValue
Country/Region of ManufactureGreat Britain
Year of Issue1960
Denomination6d & 1s6d
Stamp TypeCommemorative / Europa CEPT
ThemeEuropean Postal & Telecommunications Conference
ConditionMint Never Hinged / Unused / Lightly Hinged (choose)
Catalogue NumberSG 621–622 (Scott equivalent)
Perforation15 × 14 (check exact)
GumOriginal gum (yes/no)
Certification(if you have a certificate, mention issuer)
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Valuation / Reference Price
Based on online dealer listings:
One listing: set of 2 (mint) starting at £2.55 (used) and £5.65 for unmounted mint. 
Another dealer lists the set at £5.95 (UM) 
On eBay, similar single stamp “GB 1960 SG621 6d … MNH” sells for ~ £1.18 
Thus your full set in excellent MNH condition might reasonably be priced in the £5 to £10 range (or more, if exceptional). If hinged or less perfect, adjust downward.
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Recommended Listing Price
I suggest a “Buy It Now” price of £7.50 (for strong MNH set)
You could also accept immediate offers (e.g. “Buy It Now £7.50 or Best Offer”).
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Auction Option
Start Price: £3.00
Reserve Price (optional): £5.00
Duration: 7 days
Add “Buy It Now” option at £7.50
This gives room to attract bidders and still allow a buyer to pay your desired price if they don’t want to wait.