visa expire on Jan 17th, can i still come back in on Jan 7th?

My current tier 2 expires on Jan 17th. I have all the documents ready (contract, certificate of sponsorship, etc) but I need to go abroad by xmas and will be back on the Jan 7th. It’s risky if i do the extension now – i’m worried the chances that i don’t get back the biometric resident permit before xmas. so, i’m thinking to send the application once I come back from holiday on the 7th.
does anyone has experience and by any chance to know that if the airport immigration officer will let me in on the 7th coz my current one expires soon? (though surely i will take all my documents with me)
Many thanks indeed!

有合理入境理由的話是可以的,沒有合理的入境理由,即使是有簽證也可能進不了

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