Let’s see if I can help. I’m based in Chester, so too far to come and have a hands on. But I’ve restored and setup a number of PT’s, but not this particular make / model. However, the process is always the same. Do you have a good straight edge and a clock on a stand? if you have a OneWay measure that would be perfect.
1. The spindle and the cutter block are fixed, so this is your primary reference. First off, use the clock to measure the height of the spindle body (find the maximum height of the spindle by moving the clock back and forth) at one side from the outfeed table. You do not measure the top of the blade, but the actual metal of the cutter block. Make a note, and without altering the measuring system, move it to the other end and measure again. These must be the same. If they are not, the first thing to do is level the front edge of the outfeed table to the spindle / cutter block.
Now I don’t know what blades you have in it / spiral block, or whether you can adjust the height of the outfeed table in a similar manner to how you adjust the infeed table. If you have controls to set the height of the outfeed table, ignore the step 3
2. Once you have the table level with the spindle, now measure from the outfeed table the height of the blades, you need to find the maximum height of the blades check at both ends of the blades. check all blades. They should be the same, if they arnt the same there is something wrong with the setting of the blades. Adjust to get them them all at the same height.
3. Adjust the projection of the blades so they are all correct.
4. bring the infeed table up so the front edge (closest to the cutter) is absolutely level with the front edge of the outfeed table. Use the clock to check. Check the ends and the middle, all the readings should be that same. If not, you have a problem with the infeed table. You need to adjust / remove, clean, shim to get the front edge level.
5, Once 4 is done, you now use the straight edge. Place the straight edge across both tables, moving the cutter block so it doesn’t interfere with the straight edge. The straight edge should touch both tables along its entire length. If not, one of the tables, usually the outfeed table will have a method of either raising or lowering the outside edge (furthest away from the cutter) to bring the two labels level with each other. Check the tables along both outer edges, and diagonally across the table. Each time you make any adjustment, start at step 1 again and check the tables are level at the front edge, and adjust if necessary. Depending on the design, adjusting the outside edge affects the inside edge. This is an iterative process, time consuming but after about three or four iterations you should be there.
Once the tables are level, blades set, front edges aligned with the spindle your good to go for surfacing. I’m assuming it’s the planing / surfacing tables that are the problem.
Good Luck.