Dose - 42g and still no effect - A. muscaria in London area just not much cop?

[Routemaster Flash]

For the sake of verbal fluency, please assume that the following came to me while I was in a yogic trance:

"I'm about ready to give up on the whole idea of eating A. muscaria for the sake of getting psychoactive effects. I've tried several times now at doses which, compared to reports posted here and on erowid, should have had me capering across the North sky with Santa and his reindeer all night long. Most recently, I consumed fully 42 grams (an ounce and a half) over the course of a couple of hours, and felt nothing more than some irritating excess salivation and perhaps a little extra body-intoxication ('warm tingles', slight ataxia) above and beyond the couple of spliffs I smoked as a preventative against nausea, and because I just got bored waiting for the mushrooms to kick in. The mushrooms had been divided into three doses of about 14 grams, then consumed with a strong-tasting beef soup to mask the flavour at intervals of about an hour. When I went to bed, I had some mild CEVs but these were probably nothing that couldn't be put down to the hash, either in intensity or character. I remember dreaming that night, and maybe the dreams were a bit more vivid than usual - again, nothing out of the ordinary.

Now these mushrooms, and others I've eaten in the past, were all picked in or around London - these were from Epping Forest, and I've eaten others before that I've picked on Hampstead Heath. All to no avail - on one occasion in the past I got a brief, cannabis-like intoxication (possibly), and on another they seemed to have no effect other than to temporarily make me amazing at chess. I guess there are three possible explanations for their ineffectiveness:

1) I destroyed the muscimol by drying them at too high a temperature - seems unlikely, since I set the oven to 100C and muscimol is supposedly tolerant of temperatures up to 185C. Some of the last batch looked a little blackened and I wonder if I had them too close to the grill, and they got scorched...but stll, an oven isn't going to get 85C hotter than it should be, is it?

2) I naturally have an enormous tolerance for muscimol, and someone else eating the same dose would have been strongly affected;

or 3) the mushrooms just naturally had hardly any ibetonic acid in them to start with.

Given the care I've always taken in preparing the mushrooms (including, in previous years, drying them in the sunshine instead of in the oven) makes me think 1) is unlikely. 2) just seems a little implausible; if people can have a strong trip from 10 grams, there's no way 40-odd grams of the same material is going to have virtually no effect on someone else. And it shouldn't matter than I split the dose, since the effects last quite a long time and I should still have had the full 42g dose muscimol equivalent in my system at one time.

Which leaves 3) - A. muscaria mushrooms around London just happen to be very weak. Does anyone else here have any input to add to this? Eg. have you eaten these mushrooms picked in the British Isles, if so how strong would you rate the experience, how much did you take and whereabouts in the country did you pick them?

(A possible fourth option, that I didn't dry them well enough and there was still ibetonic acid that didn't get converted into muscimol, can be discarded because I'd have got very sick from the I.A., which didn't happen.)

Thanks a lot in advance. I know there are some dedicated shroomers out there who may be able to add to this thread."

Edit: it goes without saying, anyone trying a new batch of these mushrooms should *not* start with a dose of 42 grams! SWIM took a calculated risk based on his prior knowledge of A. muscaria from these areas. Clearly other mushrooms from other parts of the world are much stronger. SWIM now plans to have a look for some A. pantherina if it's not too late in the year already.