i have a chip box on my tdv6 which i will be taking of tomorrow , could some body tell me whats its worth cheers

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You can buy a blue fin tuning box for £185 so second hand is a case of as much as someone will pay. Try advertising it in the for sale section but bare in mind its second hand, and unless you have all the original paperwork to go with it, power increase, torque increase and mpg increase are all an unknown and that it works by fudging data rather than programmed parameters  2x TDV6. SE and HSE. Both returned to sender with issues👀
TDV8 Sport HSE...... Gone. Loved it but it didn't love me!!
Now rolling in MY10 Fullfat TDV8 Vogue. Slammed it to go round corners🙈
Cruising daily #56 mph in a Volvo V8. 😱
Lots of other toys in the cupboard...😜