The Friendship Formula: Add great friends, subtract toxic people and multiply your happiness
The Friendship Formula
Overall Rating: 4.4 / 5 (average from multiple review sources, as of 24 Mar 2026)
Based on a total of 5,299 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 5,299 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Cheapest Total Price
3-5 working days
PayPal
PayPal
Visa
Visa
Mastercard
Mastercard
£7.99
Delivery from £2.99
The Friendship Formula: Add great friends, subtract toxic people and multiply your happiness
Overall Rating: 2.4 / 5 (average from multiple review sources, as of 25 Mar 2026)
Based on a total of 46,726 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 46,726 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
In stock. Express Delivery available with Amazon Prime.
Direct debit
Direct debit
Visa
Visa
Mastercard
Mastercard
£14.99
Free Delivery
🤖 Ask ChatGPT
💡 Is it worth the price?
🔁 Better alternatives?
⭐ What do users say?
The Friendship Formula - Details
▶ Finding you the best price!
We have found 2 prices for The Friendship Formula. Our price list is completely transparent with the cheapest listed first. Additional delivery costs may apply.
The Friendship Formula - Price Information
- Cheapest price: £7.99
- The cheapest price is offered by waterstones.com. You can order the product there.
- The price range for the product The Friendship Formula is €£7.99to €£14.99 with a total of 2 offers.
- Payment methods: The online shop waterstones.com supports: PayPal, Visa, Mastercard
- Delivery: The shortest delivery time is 3-5 working days working days offered by waterstones.com.
Similar products
£20.69
amazon.co.uk
Free Delivery
The Friendship Formula (An Outsmart Secrets Book)
£12.68
amazon.co.uk
Free Delivery
£20.68
Amazon-marketplace.co.uk
Delivery from £2.80
The Friendship Formula: Confidence, Communication, and Creating Lasting Bonds -: A Practical Guide to Building Meaningful Relationships That Last How ... Bonds Simple Steps to Heal Social Anxiety
£4.83
amazon.co.uk
Delivery from £2.99
£6.37
Amazon-marketplace.co.uk
Delivery from £2.80
Cheapest offer
Book
£7.99
3-5 working days
waterstones.com
Don't forget your voucher code:
Report Illegal Concerns
You are about to report a violation based on the EU Digital Services Act (DSA).