indeed, seems I have to start flying to Germany a few times a year.
or can we get them go come to UK? if only
At the moment German win for the competition for parties. But for p2p e.g individual service, London is still competitive enough.
What I like about Berlin in comparison to other cities is that. Most parties, flatates, FKK are easily approachable by public transport even during the mid night, very early morning using night bus as I do not like the idea of renting a car.
Annie Porsche, Erlebsniswohnung, King George, Caligula, Airpotgierl, Imsomnia, Avarus on specific dates, FKK artemis, Erlebnis Kino just a few to name. All of them are approchable by public transport. You could buy a one day ticket for Zone AB and valid until 00.03 in the following day for EUR6.20, travel as many as you want within that zone. I have not found in any city in Germany where I could get similar to this.
Also if you leave in London and time for traveling is flexible there are a lot of cheap flights from London offered by Ryan Air, Easy Jet, German Wing, Norwegian Air (sometimes), for less than £20.00 one way including taxes. I have seen it for £10.00 The hotel is much cheaper than here in the UK. You could easily get a room in the city center for less than EUR50 pn.