This is very true. The OP played the game by all the TA rules - he was on hr1 for a short term move - there had been a triple top formed H&S with broken neckline and a series of lr hi’s after the triple top.
Below is a the chart that the OP was looking at just before sell entry.
So what happened Oct26th?
First thing is to understand that the up move was GBP only and not USD selling (see eur/usd) - and right now the market is debating how soon the BOE will raise rates. The BOE are recently signalling sooner rather than later although there is a huge debate therein.
Bottom line is that any news that has a bearing on BOE decision making will cause price to move beyond what it would be expected to do.
Buyers came in on Oct26 but not enough to make the triple top, 2 days later they had another attempt and again not enough of them to reach the previous high - so price then duly fell due to lack of buyers (not to say they won’t be back)
Edit: forgot to say - the CBI UK Retail report was released Oct26 - 30 vs 13 expected.