If you go Suplex up front, brake reaction bears, pan hard rod, and tuned rear shocks to match then parts will be around £1300. If you go new front springs to suit your ride desire, under spring bearings and Avo's all round' brake reaction bars and pan hard rod then your probably looking at around £800. This option will give a more traditional feel.
Labour should be around 6-8 hours I would suspect. So need to add £360-480 plus vat I would think.
Not cheap but worth while, by the if you are doing this pay the extra and replace that king pins with hard chrome ones and the better bronze bushes this will add around £200. Labour should be the same as it all has to come apart anyway.
Nice summary.