Courgette Varieties?

It's that time of year again - when a cuppa & a seed catalogue by the fire seems more tempting than being outside. 

I can't grow courgettes outdoors here so I need a self pollinating variety .

I've had a lot of success with "Partenon F1" in previous years but none of the places I usually buy from seem to be getting any in.
I'm reluctant to use Thompson & Morgan because of customer service issues but if anyone raves about their "Sure Thing" courgettes I might slum it this once.

Does anyone have other recommendations?

Thanks, Windy.

I'm in glasgow

Ah the tropical south!
Seriously, though, thanks for your input I'll look at that. 

An outfit called dutchgardenseeds.co.uk seems to have Partenon F1.

Caveat emptor, I have never done business with this company.

I'm not 100% Sp, but don't think we can legally buy seeds direct from the EU any more

I thought since the web address had UK in it, that outfit might legally sell in the UK as well(?). Their shipping information seems to indicate that they do (rate might be OK for a large order, steep for just a packet or two). I have no idea what UK customs and agriculture departments might think of it though.   

we grew 2 varieties this year sunstripe a yellow striped fruits and ambassador green variety both cropped well

The most prolific courgette plant I've ever grown was called Black Beauty.. we had dozens from just one plant.

Thank you so much for all the suggestions.

I am specifically looking for something that does well in a polytunnel.
I've seen "Sure Thing" at King's seeds now too but they have dearer delivery for seeds to my address than T&M (£5.45 vs £2.99).
Next time it rains & the fire's lit I'm going to have a look at whether either of them have other things I want.
Windy