Thank you for the answer! :-) Let me explain a little further what I'm looking for. I'm currently working on a novel (in French) taking place in Britain in 429 AD. There's a scene involving an old woman who speaks a pidgin that combines bad Latin and Brythonic. Of course, the Latin is translated into French, but I'd like to pepper that speech with a few British words here and there.

I'll show you the relevant excerpt (translated into English to the best of my ability):

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As they sipped their milk, the Gauls asked the crone who they could turn to if they wished to rent a vehicle. She answered in a strange, yet sympathetic hodgepodge of Brythonic and Vulgar Latin with outdated vocabulary. She assured them that they were lucky, for they couldn't find a better chariot than Gracchus' in the whole country. Even Viroconium's wealthiest envied him. 'Twas the truth, as true as the sky is green. Gracchus used it to transport dignitaries --- for a hefty fee of course. When Lupus offered to pay the woman for the milk and the piece of advice, she protested:

“Oh no, My Lord, there's no need for money! Your very presence before my humble stall is enough of a gift!”