Thats really funny coming from the UK, the boss sure has a pair of stones! Most bosses in UK would be more frightened of you suing for hurt feelings,cold coffee, non comfy chair etc etc or one the many many silly things people are suing for these days. I love watching this stuff on the news, some solid 15 year old advice.................Reply to email with the following,
Dear Sir.
Kindly GFYS, I take no responsibility for you hiring the wrong tool for the job, or the other 4 tools that seem equally unable to get the job done. When buying/hiring tools in future please make sure they are compatible in the first place, you wouldnt buy win10 based software and try to use on a win 3.1 machine would you?
I would also like to advise you that having consulted my online legal team they have advised me to counter sue for cold coffee [insert long list here] and for a deep paper cut cut caused by having to print your email out. I was forced to print the email because I was simply too upset to read the screen copy through a haze of tears, I am currently pricing up the holiday options to get over my trauma. I am of course a reasonable person and likely to except any 6 figure sum you offer to pay in settlement, this will also save you the cost of fuel money going to court.
I apologize in being unable to return to finish your product but It has given me an idea for a much superior one, in order that I can have it ready for market next week I had to leave in hurry.
Insert appropriate sign off here
P.S While I will except bank transfer for your payment I also take paypal if that helps
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There you go mate sorted