If the previous were thermally damaged then surely you should not be replacing and walking, you should be contacting the landlord and expressing your concerns, making safe the circuit until it can be rectified, the inconvenience of losing the circuits normally pushes any landlord to say do what is needed as they don't want the tenant ringing up everyday and refusing to pay rent.
Dependent on the brand and material the spurs are made from - some can become conductive if excessively heat damaged and/or release toxic fumes as they heat up, personally I'd of refused to replaced them, made them safe and sent the payee a callout charge if they said they don't want it altering.
If its the tenant is the payee then say you can't do what they ask and they need to discuss with the landlord who responsibilty it is for upkeep of the electrics - this will be possibly a factor of the tenancy agreement and given the hazard is both a shock risk and property risk you can't replace.