Mark,
I would hate to put someone off getting a 101", but are you sure that it is the right vehicle?
Reasons behind this are,
You are after a reliable workhorse, even the youngest 101's are are 27 years old.
Are you going to be driving a long way in it? They are not the most user friendly vehicles.
Will you be towing with it? They are excellent tow vehicles, that's what they where designed for, but there is only a NATO hitch on the rear cross member. If you have to fit a drop plate to the vehicle there are no holes in the chassis for the tie bars to mount to.
Fuel consumption, is 12 - 15 M.P.G on road alright?
Alot of the LHD vehicles are 24volt, will this be a problem?
Service and repair, you say the local dealer in Spain will have a fit if they saw one. Also you will be trying to get parts for a 30 year old vehicle when there was only about 2500 vehicles built to start with. Lots of the parts are not used on any other Landrover. The owners club do have alot of spare parts but, the club is run by volunteers they all have full time jobs. Supply of parts is as and when they are in stock, some parts you will have to wait until other people have ordered the same part, this keeps the costs down. The club is excellent but is based on enthusiasts repairing their vehicles not a business being dependant on the vehicle working.
As a last thought how long are you prepared to wait to find the right vehicle? The number of 101's coming up for sale is getting less.
This is not meant to sound negative or to try and wind you up, this is just my opinion.
I have had a 1975 RHD 12volt G/S 101 for the last 4 years. I use it for off-road fun days with my local landrover club. So far this year the starter solinoid has caught fire, 2 hub oil seals have failed and there is an intermitant fault with the diff lock warning light electrics. At the moment it is parked on the drive on axle stands waiting for a new set of brake shoes to arrive.