For the syntax geeks

[fizzwheel]

Which one is Mr Pedant going to think is the right one ?

I'd suggest that modern/crisp also should mean "easy to read". Personally I always find the comma just aids in reading numbers tho I tend to get "number blindness" (made up term).

I'm guessing with larger numbers tossed around in conveyancing (eg. £123,000) you'd use the comma without hesitiation so I'd just go with consitency.

Or, follow the style of any accompanying official documents - is it going off with a land reg form or something?

Not to anyone 'official' - to a client.

Have decided on the comma

Originally Posted by Ed

Have decided on the comma

Good man - as someone else said, makes it easier to read

[Bibio]

i was going to say as well as the numbers include written figure as well, like a cheque.

that way there is no confusion as to the sum:

the sum of four thousand three hundred and seventy pounds and sixty pence.

I'd go with no. 2 if you want it to be formal

[Stu]

You're charging him how much?

[yorkie_chris]

£4.37060x10^3

I was taught to use option 2 and beat anyone to death that used option 1 . HTH .

[Spiderman]

from a salesmans point of view i'd show the first one in a bill to a client Ed. Its one of those psychological ones like £19.99 is less than 20 quid thing is.

The comma emphasies the thousands and will delay him writing a cheque. We used to do that in sales all the time mate