Embassy legalisation for use in Singapore
Here is the plain position. Singapore accepts a simpler single-step certification, so no mission signs anything and the consular route falls away. Embassy legalization for Singapore from Manchester is not something to arrange, book or pay for, and a British certificate on the sheet is the whole of what the receiving side gets to see.
That has a tidy consequence for anyone comparing offers. A corridor with one office in it can only cost so much and can only take so long. Once you know consular legalization for Singapore plays no part, a quote and a promised date become easy to read, because there are very few honest lines either of them can carry.
What a bill for this corridor can hold
Three things, and no more. An official fee applies to each sheet the FCDO Legalisation Office marks. Postage is charged in both directions, and tracked post costs more than ordinary post for good reason. Anyone acting for you may charge for their own time, and that is a service you are buying rather than a public charge.
Everything else is an invention. A fee set by a mission, a charge for an appointment, a surcharge for handling a file abroad: none of these can occur, because no office outside Britain touches the paper. Someone quoting for embassy attestation for Singapore is quoting for an errand that ends before it starts, and the money buys no extra standing for your sheet.
The Manchester → Singapore route step by step
A civil record starts at Manchester Register Office, Heron House, 47 Lloyd Street, Manchester M2 5LE, which reissues birth, marriage and death entries as fresh certified copies signed by the registrar. Order one of those for the journey and the sheet in your own drawer stays where it is, which matters because it cannot simply be reprinted at the far end.
From there one address does the rest. The FCDO Legalisation Office at PO Box 6255, Milton Keynes MK10 1XX works through the mail for the whole country, so living in Manchester neither speeds the job up nor slows it down. To legalize documents for Singapore is therefore a two-envelope errand, and the envelopes are the part you control.
Reading the clock as carefully as the bill
Standard handling at the desk takes 7–10 business days and express handling takes 2–3 business days, and those figures cover the desk alone. No queue forms behind them, because there is no second office waiting for the sheet. Document legalization for Singapore is finished the moment the envelope leaves Milton Keynes for your address.
So a promised date that runs to several weeks is describing postage, caution or someone's backlog, not a rule of the corridor. Work out your own timetable from the two figures above plus the days each envelope spends in transit, and you will know quickly whether a quoted date is generous, tight or simply guessed.