Builder who's 27 29 when the job's done (3)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Builder who’s 27 29 when the job’s done The reference is to the BBC children’s TV programme Bob the Builder AND also to the expression Bob’s your (=entry at 27) uncle (=entry at 29), to indicate the successful completion of task, a result; this is the gateway clue to today’s puzzle