The Friendship Formula: Add great friends, subtract toxic people and multiply your happiness
The Friendship Formula
Overall Rating: 4.5 / 5 (average from multiple review sources, as of 8 May 2026)
Based on a total of 5,439 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 5,439 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 9 May 2026)
Based on a total of 47,062 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 47,062 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
The Friendship Formula: Add great friends, subtract toxic people and multiply your happiness
Overall Rating: 4.8 / 5 (average from multiple review sources, as of 13 May 2026)
Based on a total of 252 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 252 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
Direct debit
Direct debit
Visa
Visa
Mastercard
Mastercard
£22.21
Free Delivery
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The Friendship Formula - Details
▶ Finding you the best price!
We have found 3 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 €£22.21 with a total of 3 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.
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