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Most invalidation talk is about where to put the stop once you're in. I'm more interested in what makes me cancel a trade before I enter, because on GBPJPY that list has saved me more than any stop technique.

My pre-entry invalidations, in rough order of how often they apply:

Spread above 1.6 pips. Happens most often in the first minutes after 07:00 and around 13:30.

A Japanese official comment in the last 30 minutes. Any comment about the yen, however mild.

Price inside the middle third of the Asian range. GBPJPY in the middle of a range is noise.

The trade would put my stop inside the last M15 candle's range. That usually means I'm trying to squeeze a trade out of a spot that's too tight for this pair's volatility.

USDJPY and GBPUSD disagreeing. If USDJPY is falling and GBPUSD is rising, GBPJPY is being pulled two ways and often goes nowhere useful.

My last two GBPJPY trades were both losers. Any third trade on the pair that day needs a much better setup, and usually I just don't take it.

A UK data release within the next 15 minutes.

My entry would be more than 50% of the way through the day's average range already. Late entries on GBPJPY have a poor record for me.

What I'd like to know is what's on your list that isn't on mine. Particularly anything to do with the yen side of the pair. What would you add?

Your middle third rule would top my list, and I apply it strictly. I split the Asian range into thirds at 06:55 London and anything triggering inside the middle band gets cancelled, even if the M1 trigger looks perfect.

The chart below is an illustrative GBPJPY M5 morning where price chopped inside that middle band for the first ninety minutes of London, then broke the top of the range. Nothing in the chop was worth a ticket.
On the yen side, I add Nikkei futures. If they are down more than 1% since the Tokyo close by the time London opens, GBPJPY longs are off for me, because the risk tone can override anything sterling does.

I also cancel when USDJPY sits within about 30 pips of a level where officials have stepped in before. The pair gets jumpy on rumours alone, and a rate check headline can blow straight through a tight stop.

One I am less sure about is EURJPY. If it disagrees with GBPJPY on the M15, it usually means the move is sterling only, which I treat as a weaker setup rather than a cancel. Do you treat that kind of split as a cancel or just as a size cut?

LondonScalper, one gap in the middle third rule shows up on Japanese holidays. With Tokyo shut, the Asian range on GBPJPY can be 40 pips or less, which makes each third about 13 pips and too narrow to separate signal from noise.

So when the range is under about 50 pips, I stop splitting it and treat the whole box as one no trade zone until London breaks out of it. On those mornings the first clean break has been worth more than any fade inside.

I would also reframe your spread line as a share of the stop. A 1.6 pip spread is fine on a 20 pip stop, but on a 10 pip stop it eats 16% of the room before the trade starts, so my cap is spread under a tenth of the stop.

On the yen side, a move of more than about 5 basis points overnight in the Japanese 10 year yield goes on my cancel list. Those mornings have tended to bring yen headlines straight into the London open.

None of these replace your list. They mostly stop it from being applied to a morning it was not built for.

How wide has your average Asian range on GBPJPY been lately? Mine has narrowed enough that the 50 pip floor triggers more often.