Thanks everyone for the replies, however when I referred to the shuddering as we stopped. It started at no more than around 10kts until something like 5kts when he released them and then again down to 0kts. The shuddering didn't happen on the runway as we performed the RTO.
In response to G-DALE's question I visited the flightdeck in Dublin and the Captain just said it was a light that came on.
They were off to Reus in less than half an hour after that so I don't think any engineering presence was needed in Dublin.