I would remove the tie rod to isolate the issue before expending much energy on fixing it. The relay is by far the most likely issue. If completely dry, it is likely to be very hard to move, as the fibre bushes will be rusted to the shaft.
If original, there should be a filler plug on top of the shaft. Remove this and fill with oil, topping up periodically as the level falls. At this stage, the type of oil is pretty irrelevant, although penetrating oil will probably work quicker - but also probably run out the bottom quicker! About a week of this should free it up.
There is a slight possibility it is the steering box, and making sure it has oil in it is worthwhile.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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