This might help - although its now quite old.
Use CFD's - derivatives do not attract stamp duty. Firms offering CFDs normally advertise in the FT.Find a broker that allows you to enter orders directly into the SETS book. (Subscribe to ADVFN's Level 2 to view the book in real time from your screen)Looking at ARM currently (Best example I can find quickly - there's no good examples when the market is closed):
 | Level 2 | |  | | 06/01/2001 | | 16:16:50 | | Help |  |
ARM HLDGS. (ORD 0.05P) | | | | Prev.Close 502 | GBX |
NMS 50000 | ISIN GB0000595859 | Sector FT10 | Segment SET1 | SEDOL 59585 |
Last trade | 515.758 O | at 17:13:23 | Vol 5,000 | Prev trades | 508 | 500.738 | 501 | 505 | Trade Hi | 532 | Trade Lo | 491 | Cum Vol | 6,420,387 |
| Cur Hi | 530 | Cur Lo | 496 | Open | 497 |
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Buy Volume | 41,973 | Depth | 8 | Avg.Size | 5,247 | VWAP | 489.959 |
| 2,114 | 501 | 1,057 | 500 | 6,000 | 500 | 2,114 | 498 | 5,000 | 491 | 3,000 | 490 | 12,688 | 488 | 10,000 | 480 |
| 508 | 3,540 | 508 | 50,000 | 514 | 2,000 | 519 | 12,688 | 520 | 10,000 | 537 | 5,000 | 617 | 1,000 | 700 | 6,000 | 750 | 1,850 | 780 | 1,229 | 790 | 425 | 800 | 8,525 | 1050 | 700 |
| Sell Volume | 102,957 | Depth | 13 | Avg.Size | 7,920 | VWAP | 560.988 |
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If you don't understand what you're looking at, click here, otherwise this explanation will be wasted on you. :-)
This looks like an intraday short from good resistance @ 508.If I were to short ARM 3,000, I have three options:
1) I can sell 2114 at 501.5, with the remaining 886 at 500.5 and be instantly filled at an average price of just over 501. This is what a conventional broker will probably offer you if you wanted to short or close a long.2) I can place a sell order for 3,000 @507 (or 507.5) - in which case everybody's screens will update to show a new price of 501.5/507. I run the risk of not being filled or of being part filled if somebody else comes in at say 506. Interestingly, If I were filled @ 507, I could immediately place a buy order @502, which, if filled, would net me an instant 1% before commission (I pay 0.5% for the round trip).3) I can place a sell order at 508 - in which case I join the back of the 508 queue, and get filled once all of the other 508s are filled (Dumb move on this book, but would strengthen the resistance if I was already short)
In this example, my whole short would have been based on the resistance at 508 (50,000 is a significant sell order for ARM). So my stop loss says that the second 508 is breached, or the 50,000 @ 508 order is withdrawn, I'm out. I would have been proved wrong. ie stop loss is near as damnit 0%.
Hope that answers your questions.
Gausie