Yes, you have to take both tests:
RETURNING TO L PLATES
When the Driver and Vehicle Licensing Agency is notified that a new driver has six or more penalty points they will write to him/her to say that the licence has been revoked. The driver then reverts to learner status and is treated like any other learner. He or she has to apply for a new provisional licence, display L-plates and is prohibited from driving on motorways. A learner car driver will need to be accompanied by a driver aged 21 or over who has held a full licence for at least three years. A learner motorcyclist will be restricted to smaller less powerful bikes.
And:
http://www.salford.gov.uk/living/streets/roads afety/rs-info-roadusers/rs-drivers/rs-newdrive r.htm