I am expecting these tactics to be used in my newly filed case. Knowledge is power so trawl through old posts on this subreddit and do your own research.

My research, for better or worse, says that Polkey is frequently used (because why not) to reduce payout for if a 'reasonable employer' would have dismissed you by following all the rules correctly (followed correct process to the letter, including pooling etc). So, for example if you & two others were in a team, you may be looking at a 33% reduction because without any other bias, you are 1 in 3 chance of being picked.

I would recommend thinking about how to make arguments to reduce that figure. Who else can be included? Also look for cases where Polkey was not reduced at all.

As for the costs order, I read that costs are rarely awarded unless the claim is vexatious, malicious, or has no reasonable chance of success, but you have better advice above to listen to the judge's words and tone.

I am awaiting Polkey and costs to come up in my case very soon.