Yes, possibly.
With other bits like the cost of a detailed prebuy inspection (basically paying somebody to fly out there with you) you are talking about perhaps £100k, which is about right for a well equipped 10 year old plane in that class on which everything works and the engine is about mid-life.
On top of that is the import VAT
I would definitely get any avionics done in the USA, not in the UK (much cheaper, and avoids paying the VAT at this end) but do carefully select the avionics shop as avionics cowboys are not limited to certain countries.