You are correct - my apologies.
Under FCA regulations, a winning trade generally does not increase margin requirements. Instead, it can decrease them as your account equity rises, potentially allowing for more leverage. Margin requirements are typically determined by the overall risk of your portfolio and the instruments you are trading.
P.S this was Google, so I have not checked with IG. ‘generally’ perhaps does not apply to IG
Perhaps they do not consider is as equity in your account until trade closed?
Not at all, interesting conversation anyway, Johnny, thank you.
I’ve looked at IG but never tried them. You like them, I’m assuming?
For someone wanting more than 1:30 leverage, of course, the FCA regulations would be a pain, and spread-betting needs quite a lot of margin. I’m only a low-position-size trader anyway, but I like to add to winners. Just never to losers!
Glad you are wise not to add to losers!
Call me ‘old fashioned’ - I’ve been around the block a few times. I just love the IG platform.
A know it’s a well proven sin not to add to winners (big fan of Tom Hougaard) but I usually just go in full clip 1- 2%
Coming from a horseracing background, I’ve always considered a bet as a bet - win or lose. And I have seen so many guys come unstuck laying rediculous odds like 1000/1 in running on Betfair - a horse can be 20 lenghths infront and fall at the last or run out of steam in the last 50yds…
Anyway I hate regulations - look at the damage the self appointed quasi quango ‘Gambling Commission’ has done to horse racing, forcing illegal betting with dodgy off-shore bookmakers.
Always hated regulations - since I was considered a ‘naughty boy’ at school. 
It has analogies in many areas of everyday life, too: if you just “disallow stuff”, the outcome is all too often that you make people do things in worse places that are more dangerous, where you have less or no control, which hinders the people you (ought to) want to help.
Yes - when they stopped prescribing heroin in early 70s the blackmarket was flooded.