If the share price does go to the downside when it breaks out of this , then there is little support for the price on the way down, giving investors a possible opportunity to short sell Primark shares.
This is not investment advice. I am not a qualified investor. This is just my personal opinion and trading analysis which I share for your possible benefit. Always set stop losses to protect yourself from unacceptable risk, and never invest more than you can afford to lose.