I just love the UK.
So... just take a pair of sissors and a book of matches. In a pinch find a pool. I know how you feel. Actually, I took my TP2 to a local nasty lake for a shakedown before I left for Oz last October. Fortunately, around here the lakes are reasonably warm that time of year, just minimal visibility. Of course, weighting was off due to fresh vs salt water.
After over 50 dives with the TP2 I am still playing around with trim weights and such. Experimentation has shown that 3# or 1.5 kg is the most to go on the center of the upper tank band. Any more and things get a bit tippy. I am going to try threading one 2# on the tank band directly and the other 2# in a Halcyon trim pouch, on opposite sides of the tank near my back and see how that works, and will also try a single 2# in the center. I will be in salt water again on March 9. I have pretty much settled on keeping one Halcyon trim pocket on the buckle side of the belt and a weight threaded directly onto the other side of the belt.
Whild I was down in Belize our divemaster dove without any weight at all with an aluminum 80. No wetsuit either, in 79 f water. Kind of gives a new meaning to minimalism.