Was thinking of getting something like this for a long time now and noticed this today at a good price.
http://www.ebay.co.uk/itm/EASYSTEER-TRIUMPH-TR8-POWER-STEERING-CONVERSION-TR7-V8-MAY-FIT-STAG-DOLOMITE-TR6-/161087919955?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Model%3ATR+7&hash=item2581969753