Apparently it is Jon Taylor, although the exact fee paid doesn't seem clear.

But if you factor in inflation, there is a case for arguing that our most expensive signing is actually Tony Towner. We paid £165,000 for Towner and John Seasman in 1980, with an estimated £95,000 of this being for Towner.

Using UK inflation data, £95,000 in 1980 would be worth £442,239 today, a hell of a lot more than we paid For Taylor I'm sure.

Now if you include the Seasman money, we actually spent the equivalent today of £768,100 in one go as a THIRD DIVISION CLUB on average gates of 6,000.

I think this puts into perspective all the nonsense we have heard over the past three years about breaking club transfer records