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If you bubble-wrap your greenhouse for winter, have you "unwrapped" it yet? If so, do you then put shading up straight away?

I guess it is each to there own here!

Because I have more than one greenhouse I rarely (if ever) take my insulating layer down and just leave it to form the shading. Not that I grow much in this greenhouse in anycase, I tend to keep it as a propagating greenhouse.

However to answer your question.......when I was in a similar position to you I rigged my insulating layer (I don't use bubble wrap I use cellophane it lets better light through during the winter months) so that the roof part was easily removed to allow maximum light in, yet easily put back in periods of cold weather.
The sides were lined separately as well, again for similar reasons in the winter months.

However as with the location of many greenhouses only one side of it generally requires shading fitted so I would leave the insulating layer on,on the side most affected by the sun.

If I were to remove it, I would probably remove the roof part in mid April and the remainder about the end of May.

I say this advisedly because even the 'winter sun' through glass can be quite intense, and the seedlings that are likely to be in the greenhouse can suffer, hence leaving it to late on to remove.

I am afraid location of the greenhouse and what you grow plays a major part in the decision as to when to remove the insulation/shading

nd finally, do tomato plants suffer from draughts? I've put a new workbench in my greenhouse this year & the only floor space for the tomatoes is next to the door.

Tomatoes like good air circulation around them so there should be no major problem.

I would mention though that a door left fully open causes less draught that a door left ajar.

I would tend to either leave the door fully open on the warmest of days and rely on the vents to keep the air circulating when the door is fully closed on cooler days.

I hope that answers your question.