In article ,
"Sparks" writes:
In an office, where there is a small garden, are the sockets that are
supplying the office with a door to the garden *Required* to be RCD
protected?

No.

Ignoring the garden completely, is the any requirement to have RCD
protection in the office at all?
(Office contains the usual officey things, such as PC's lamps, franking
machine, photocopiers, binding machines etc..

No, actually it's rather unusual to do so IME.

The reason I ask, is, the office I am working in at the moment has
approximately 30 PC's

If there are more than around ~5 or so on one circuit, it should
be wired with high integrity earthing.

It has three consumer units, all with MCB's and isolator switches.

Another issue is, the radial circuit feeding the server rack will trip when
the UPS is initially turned on, so I feel the wiring may not be up to
standard!

Is that an MCB or RCD? UPS's (good ones at least) often draw
almost no current when first switched on. They tend to wait for a
bit to see if the supply is going to stay on before they start
drawing their normal load or switch over their outputs. As such,
they are very nice loads with regards to power up surges.

The office wiring should be getting periodic inspection/test, and
it will typically say when it was last done near the supply head.
The appliances in the office should be getting periodic PAT testing
and have stickers say when they are next due for testing (or serial
numbers which reference a database with that information).

Also, the electricity meter is rated at 40A, when I measured the meter tail,
the office was drawing about 55-65A - the electricity company didn't seem to
worried about it until I told them their main fuse was getting quite warm -
they got this changed to a 100A one, but the meter is still only 40A -
should I be worried?

That seems to be the norm in my experience. I had an office supply
uprated to handle new air conditioning units, and the same was done,
with the meter being potentially over loaded without any apparent
concern (and it didn't get hot AFAICR).

--
Andrew Gabriel