Can someone confirm the price of a Compulsory Basic Training Cerificate?

I let mine obtain out of date by 5 weeks and be reminded today while in Argos where on earth I bumped into my trainer who told me it needed re doing!
I have a friend who have very big-heartedly offered to pay for it.
I have an idea that it's about 100 if you own your own bike (which I do).
Help is greatly appreciated as he's already wrote the cheque!!

Answers:    Please make cross-question clear
Certificate of which basic course ?
There are hundreds of prime certificate courses contained by the word !
Repeat it with clarity
Good Luck

Where and how much?
Only instructors certified by the Driving Standards Agency (DSA) can educate CBT at an approved training body (ATB). ATBs must have instructors who enjoy successfully completed a two day assessment and hold sites approved by DSA for off-road training.

The cost for the course varies typically from 70 to around 100. Most ATBs propose the loan of machines and helmets for the course. The cost of CBT may be incorporated into the cost of a full training course that leads to a motorcycle exam.