Taken from Aircraft Rules 1937
Schedule II , Section L
3. Renewal – The licence may be renewed on receipt of satisfactory evidence of the applicant.
(a) having undergone a medical examination in accordance with para 1(c) above
(b) having satisfactorily completed not less than ten hours of flight time as Pilot-in-Command(Fifty percent of flight time as Co-Pilot may be counted towards the requirement of flight time as Pilot-in-Command) within a period of six months immediately preceding the date of application for renewal, or in lieu thereof, having satisfactorily completed the general flying test by day and night as laid down in clause (h) of paragraph 1 within the same period; and
(c) having a current Flight Radio Telephone Operator’s Licence for operation of radio telephone apparatus on board an aircraft, issued by the Director-General.
Look at part b
From my understanding of whats written here
1 )At the time renewal you should have either 10 hours PIC in the past 6 months
or
2) 20 hours as Co Pilot time within the past 6 months
or in lieu of the above
3) Give a skill test i.e Day Check and Night Check
Honestly speaking go and pay the DTL a visit . Even though you show them the rules they always seem to have their own methods on how to implement it
Take a print out of the rules to show it to them just in case they forget it .