Paul, I'll try to find some sources over here in North America and keep you informed. Here are some manufacturer part numbers and wattages that may help in your hunt over in the UK.

It looks like we're the only ones with a roof top "cuckoo" mate. I have the 444 green book bible and both the Fixlight roof and side mounted lights (as on my PV) use a BA 15 s, 15 watt bulb (same as interior light). The cuckoo uses 3 bulbs; one is for the centre blue indicator. I believe you have the newer "citylights" on the side pillars, that use 2 light bulbs. The signal uses a bayonette style 15 watt bulb, ELITE 6V 15W 2302, B1. The driving light, that shows clear to the front and red to the rear, is a peanut sized bulb (similar to dash light bulbs) Philips 6V 1,5 W IMPORT Typ. 6913 N, or BA 9.

BTW, had the appraiser over yesterday and he seemed more impressed with my Amazon-S! I guess a black, standard PV444 looks too "plain Jane". We'll see what he comes up with and I'll share this appraisal with all that responded to my other postings.
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Cam a.k.a. CVOLVO.COM