Another update, not sure when the new probate application was submitted but we're still waiting on it being finalized, 2 and a half years at this stage. I attended a meeting with my father and the solicitors earlier this year and I asked for a ballpark final figure including court proceedings and they said 20k. My father was shocked at this and they said it may be less, I suggested it could also end up being higher and they agreed.
My father got a letter last week and the current bill stands at 34k.