First Road Bike for large guy

LondonGuy35

I'm looking to get a road bike, firstly a second hand one budget £250.00 give or take. But can i ?? the problem is im 6,3 and 110kilos. I currently have a great mountain bike a Marin Bolanis ands its great.

Trying second hand first as my works cycle to work scheme doesnt open again until march.

Any recommendations???