British English spelling: “gripped” or “gript”?

Hello what is the correct British English spelling of the word 'gripped' or 'gript'?

According to Dictionary.com:

gript
verb 1. a past participle and simple past tense of grip.

verb (used without object), gripped or gript, gripping.

e.g. The boat now run ‘pon the top ov me; I was gript by the scruff ov the neck, and dragg’d into it.
_{Humours of Irish Life}

In Australian English, which for the most part is similar to British English, I have never come across “gript”. “Gripped” is the only form of the word that I have ever come across. I suspect that the former is probably old English, and no longer in use, or looking at the usage example, possibly a “dialect spelling”.

According to Middle English Dictionary, Volume 4 By Hans Kurath, gript was one of the spellings all those hundreds of years ago.

Beyond that we can look at Google ngram: gript,gripped. From the graph we can see that the 'gripped' spelling took off from 1850 onwards.